One morning when I was in a hurry to get to work, everything went wrong in an instant: an SMS message alerted me to an $80 charge to my credit card for a purchase that I never made.

What did I do next? I blocked my card, filed a claim at the bank, and got a new card issued. I must say that in the end, all the troubles were resolved and I got my money returned to me. Mostly, thanks to my prompt reaction. However, how it all ended is not the purpose of the story — it is about the lessons that I’ve learned.

Lesson #1. Promptness is what matters

It applies to any bank in the world: the faster you react and prove that there was a hack, the better the chance that you will have to get your money back. In order to succeed, you need to be notified of unsolicited transactions ASAP, ideally via SMS notifications.

Daily e-mails on an account status are also OK. Scrupulous tracking of monthly bank reports is a last-resort measure if you’ve got no better options. I had SMS notifications enabled, so it took me just 5 minutes to block the card and claim the unsolicited transaction in question that same day.

Lesson #2. All types of insurance will do

Each extra level of protection makes it harder for scammers to reach their goal, and ultimately minimizes your losses. For this reason, you should enable 3D-Secure (MasterCard SecureCode, Verified by Visa) for all online payments and two-step authentication in your online banking tool, choose terminals with chip and PIN support and say no to those requiring only a swipe and signature.

Do online payments only on secure Wi-Fi networks and install a robust antivirus solution on your PC. Additionally, insurance would also help: such products can be activated together with any banking card.

I approached all of these measures together. So maybe there had been attempts by scammers to steal money from my card before, but I never noticed because these attempts had been fruitless.

Lesson #3. Precaution is not a cure-all

Unfortunately, scammers’ wellbeing directly correlates to their ability to bypass all security measures that may be in place. That’s why all of the measures I described above cannot fully protect you. The most effective way to say goodbye to your hard-earned money is by withdrawing cash in ATMs with scamming software installed by culprits, or by executing online payments on a compromised machine. In the first case, the criminals would duplicate your card credentials to withdraw cash. In the second case they will spend your funds online.

I have been very cautious with my cards, so I likely fell victim to a more sophisticated approach. As we have learned this year, paying with your credit card at large retailers can be potentially dangerous, if a special Trojan has infected their systems. This specifically applies to American retailers because often they use outdated POS terminals. My card used to be frequently used in the US and there it is likely to have fallen victim to such a scam.

There is one more option that cannot be ignored — a leak of payment data from one of the online merchants. I have 3D-Secure enabled on my card, but a criminal could have somehow managed to track down the shop, which used an outdated processing system with no support of 3D-Secure, and therefore charged my card.

Lesson #4. Using credit card scams is an organized crime precedent

I came across the answer in a curious way. After having successfully blocked my credit card, I had no reason to worry for about a week. But then I received a text message alerting me to a new attempt to charge my card in some other American online marketplace, and another some days after that.  In a week’s time there was another, notifying me of an attempt to execute an offline payment at a store in Mexico.

All attempts were, ultimately, unsuccessful due to the fact that the card was blocked. That meant that someone who stole my card credentials resold it to various people (presumably in the form of a database with thousands of other card credentials), and each of them tried to use it again and again.

Lesson #5. Always have a plan B

And plans C, D and E also would be useful. In my case, the hypothetical loss was not that significant, and no serious harm would have been inflicted even if I were unable to regain my money.

If you need to boost your credit score, it won’t happen overnight.

A credit score isn’t like a race car, where you can rev the engine and almost instantly feel the result.

Credit scores are more like your driving record: They take into account years of past behavior you can find on your credit report, not just your present actions.

1. Watch those credit card balances

One major factor in your credit score is how much revolving credit you have versus how much you’re actually using. The smaller that percentage is, the better it is for your credit rating.

The optimum: 30 percent or lower.

To boost your score, “pay down your balances, and keep those balances low,” says Pamela Banks, senior policy counsel for Consumers Union.

If you have multiple credit card balances, consolidating them with a personal loan could help your score.

What you might not know: Even if you pay balances in full every month, you still could have a higher utilization ratio than you’d expect. That’s because some issuers use the balance on your statement as the one reported to the bureau. Even if you’re paying balances in full every month, your credit score will still weigh your monthly balances.

One strategy: See if the credit card issuer will accept multiple payments throughout the month.

2. Eliminate credit card balances

“A good way to improve your credit score is to eliminate nuisance balances,” says John Ulzheimer, a nationally recognized credit expert formerly of FICO and Equifax. Those are the small balances you have on a number of credit cards.

The reason this strategy can boost your score: One of the items your score considers is just how many of your cards have balances, says Ulzheimer. He says that’s why charging $50 on one card and $30 on another instead of using the same card (preferably one with a good interest rate), can hurt your credit score.

The solution to improve your credit score is to gather up all those credit cards on which you have small balances and pay them off, Ulzheimer says. Then select one or two go-to cards that you can use for everything.

“That way, you’re not polluting your credit report with a lot of balances,” he says.

If you can’t afford to pay these small balances off at once, moving them to a balance transfer credit card might help.

3. Leave old debt on your report

Some people erroneously believe that old debt on their credit report is bad, says Ulzheimer.

The minute they get their home or car paid off, they’re on the phone trying to get it removed from their credit report, he says.

Negative items are bad for your credit score, and most of them will disappear from your report after seven years. However, “arguing to get old accounts off your credit report just because they’re paid is a bad idea,” he says.

Good debt — debt that you’ve handled well and paid as agreed — is good for your credit. The longer your history of good debt is, the better it is for your score.

One of the ways to improve your credit score: Leave old debt and good accounts on as long as possible, says Ulzheimer. This is also a good reason not to close old accounts where you’ve had a solid repayment record.

Trying to get rid of old good debt “is like making straight A’s in high school and trying to expunge the record 20 years later,” Ulzheimer says. “You never want that stuff to come off your history.”

4. Use your calendar

If you’re shopping for a home, car or student loan, it pays to do your rate shopping within a short time period.

Every time you apply for credit, it can cause a small dip in your credit score that lasts a year. That’s because if someone is making multiple applications for credit, it usually means he or she wants to use more credit.

However, with three kinds of loans — mortgage, auto and more recently, student loans — scoring formulas allow for the fact that you’ll make multiple applications but take out only one loan.

The FICO score, a credit score commonly used by lenders, ignores any such inquiries made in the 30 days prior to scoring. If it finds some that are older than 30 days, it will count those made within a typical shopping period as just one inquiry.

The length of that shopping period depends on the credit score used.

If lenders are using the newest forms of scoring software, then you have 45 days, says Ulzheimer. With older forms, you need to keep it to 14 days.

Older forms of the software won’t count multiple student loan inquiries as one, no matter how close together you make applications, he says.

“The takeaway is, don’t dillydally,” Ulzheimer says.

5. Pay bills on time

If you’re planning a major purchase (like a home or a car), you might be scrambling to assemble one big chunk of cash.

While you’re juggling bills, you don’t want to start paying bills late. Even if you’re sitting on a pile of savings, a drop in your score could scuttle that dream deal.

One of the biggest ingredients in a good credit score is simply month after month of plain-vanilla, on-time payments.

“Credit scores are determined by what’s in your credit report,” says Linda Sherry, director of national priorities for Consumer Action. If you’re bad about paying your bills — or paying them on time — it damages your credit and hurts your credit score, she says.

That can even extend to items that aren’t normally associated with credit reporting, such as library books, she says. That’s because even if the original “creditor,” such as the library, doesn’t report to the bureaus, they may eventually call in a collections agency for an unpaid bill. That agency could very well list the item on your credit report.

Putting cash into a savings account for a major purchase is smart. Just don’t slight the regular bills to do it.

6. Don’t hint at risk

Sometimes, one of the best ways to improve your credit score is to not do something that could sink it.

Two of the biggies are missing payments and suddenly paying less (or charging more) than you normally do, says Dave Jones, retired president of the Association of Independent Consumer Credit Counseling Agencies.

Other changes that could scare your card issuer (but not necessarily hurt your credit score): taking cash advances or even using your cards at businesses that could indicate current or future money stress, such as a pawnshop or a divorce attorney, he says.

“You just don’t want to do anything that would indicate risk,” says Jones.

7. Don’t obsess

You should be laser-focused on your credit score when you know you’ll soon need credit. In the interim, pay your bills and use credit responsibly. Your score will reflect these smart spending behaviors.

Are you getting ready to make a big purchase, such as a home or car? At least a few months in advance, have a look at your credit score, Consumer Action’s Sherry says.

While the score that you get through your bank or a service may not be the exact same one your lender uses, it will grade you on many of the same criteria and give you a good indication of how well you’re managing your credit, she says. It will provide you with specific ways to improve your credit score — in the form of several codes or factors that kept your score from being higher.

If you are denied credit (or don’t qualify for the lender’s best rate), the lender has to show you the credit score it used, thanks to the Dodd-Frank Wall Street Reform and Consumer Protection Act.

Another smart move is to regularly check your credit reports, says Sherry.

You’re entitled to one of each of your three credit bureau reports (Equifax, Experian and TransUnion) for free every 12 months through AnnualCreditReport.com.

It’s smart to stagger them, Sherry says. Send for one every four months, and you can monitor your credit for free.