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This 28-year-old staff sergeant raised his credit score nearly 200 points by watching YouTube—here's his best advice

In the next installment of CNBC Select's "Credit Scores: Then and Now" series, we speak to someone who has raised his credit score from 604 to an excellent 797.

Photo courtesy of Kadeem Roberts

Have you made a major jump in your credit score and would like to share your personal journey? Email reporter Elizabeth Gravier at elizabeth.gravier@nbcuni.com if you're interested in being featured in CNBC Select's new "Credit Scores: Then and Now" series.

Kadeem Roberts is 28 years old with a total of five credit cards and an excellent credit score. But that wasn't always the case.

Roberts, who went to college for two semesters and withdrew because of the high cost, was doing odd jobs before a sales job rewarded him with a good salary. While he was looking to buy his first car with his new salary, he soon learned that he couldn't qualify for a loan to do so because his score was around 604 at the time, Roberts recalls.

"That was the first time I really started realizing how important credit was," Roberts tells CNBC Select. He ended up using cash to buy a car from a friend and spent the next couple of months turning to YouTube to learn about credit. He would search things like, "how to build good credit," and find videos that covered the subject. This is when he began paying off all his debt, which included a little over $1,200 in student loans and a maxed-out credit card with a $1,000 limit. Slowly, he saw his credit score start to increase. 

At age 23, Roberts enrolled in the military and is still currently serving as a staff sergeant in security forces, stationed at Francis E. Warren Air Force Base near Cheyenne, Wyoming. He says he is also working on his bachelor's degree in business administration with a concentration in IT management.

Photo courtesy of Kadeem Roberts

When asked to pull his latest score for this story, Roberts' score by Equifax and TransUnion (two of the three main credit bureaus) calculated an excellent 797 using the VantageScore 3.0 model.

Below, Roberts, who recently authored a book called, "The Secret To Mastering Credit: A Beginner's Guide," shares his No. 1 advice to raising your credit and reveals the five credit cards he carries.

Roberts' No. 1 piece of advice

Roberts is big on appealing to the younger generation because he knows how much of a difference learning about credit early on can make. In his early days, he says he would charge a lot of day-to-day things and rely on credit to get by.

His No. 1 piece of advice in having good credit habits is this: get informed about the basics.

"The number one thing I would say is just try to understand at the basic level," Roberts says. "There's so much information floating around out there about what's good for credit, what's bad for credit — [just] understand the fundamentals. It doesn't matter if you're trying to build or repair [your credit], the fundamentals are always going to be the same."

These fundamentals, or rules of thumb, include paying your credit card bill on time and in full, as well as keeping a low credit utilization rate (the ratio of how much credit you use to how much you have available). Roberts also recommends understanding what your credit card company is reporting to the credit bureaus. And if you're like many and already have credit card debt, he recommends making an actionable plan to fix it over a specified time frame.

"I'm a big advocate for credit cards, even though I did have credit card debt," Roberts says. "It's just a matter of understanding how to use them properly."

How does Roberts use credit?

Roberts no longer has student loans or credit card debt, and he is in the process of buying rental property. He has a debit card, though he says he can't remember the last time he used it. Much of his spending goes onto one of the five credit cards he carries.

"Pretty much any bill I can pay with a credit card, I pay with a credit card," Roberts says. For him, this includes charging his cell phone and Internet bills, as well as his car insurance. He pays rent with a check and makes sure to pay his credit card bills off on time and in full every month to maintain a high credit score. Note that you should avoid using a credit card when there are processing fees, which often run between 2% and 3%.

Of the five credit cards Roberts has, two are business cards that he uses for marketing his book. These cards help him separate his personal expenses from his advertising expenses. 

Here are all five credit cards he carries:

  1. Amazon Prime Rewards Visa Signature Card: Roberts' first ever credit card and the one he uses every day, the Amazon Prime Rewards Card, is worth holding onto. It's his oldest card, and longevity of credit can be an important factor in calculating credit scores. The Amazon Prime Rewards Card ranked on CNBC Select's overall list of the best rewards credit cards because of its perks for groceries, online shopping and streaming, as well as its generous sign-up bonus (a $70 Amazon.com gift card upon approval). With his Amazon Prime membership, this card lets Roberts earn 5% cash back at Amazon.com and Whole Foods Market, 2% back at restaurants, gas stations and drugstores and 1% back on all other purchases.
  2. Bank of America® Cash Rewards credit card: The BoA Cash Rewards card offers Roberts 3% cash back in the category of his choice (online shopping, dining, travel, drugstores or home improvement/furnishings), 2% back at grocery stores and wholesale clubs and 1% back on all other purchases.
  3. Blue Cash Everyday® Card from American Express: Amex's Blue Cash Everyday Card ranked on CNBC Select's list of the best cash-back credit cards with no annual fee because of its grocery rewards. With this popular card from Amex, cardholders like Roberts can earn 3% cash back at U.S. supermarkets (on up to $6,000 per year in purchases, then 1%), 2% back at U.S. gas stations and select U.S. department stores and 1% back on other purchases.
  4. American Express® Business Gold Card: For those who have business expenses like Roberts has for marketing his new book, the Amex Business Gold Card lets you earn 4X Membership Rewards® points on the two categories where your business spends the most, plus 1X point on other purchases. These categories can include expenses made on business travel like airfare, gas stations and eating out. For Roberts, this card comes in handy because of its advertising and shipping expense categories.
  5. Bank of America® Business Advantage Travel Rewards World Mastercard® credit card: Another business card, this one lets Roberts earn unlimited points for his business purchases. The BoA Business Travel Rewards card offers an unlimited 1.5 points for every dollar you spend and an unlimited 3 points per every dollar when you book your travel (car, hotel, airline) through the Bank of America® Travel Center.

Roberts' next card? He has his eye on The Platinum Card® from American Express to help cover future travel costs.

Information about the Amazon Prime Rewards Visa Signature Card, Bank of America® Cash Rewards credit card, and Bank of America® Business Advantage Travel Rewards World Mastercard® credit card has been collected independently by CNBC and has not been reviewed or provided by the issuer of the card prior to publication.

Editorial Note: Opinions, analyses, reviews or recommendations expressed in this article are those of the CNBC Select editorial staff’s alone, and have not been reviewed, approved or otherwise endorsed by any third party.