>>60636948 (OP)Get a credit card and use it for a portion of your utility bills that keeps you under 15% of your credit limit.
Do that consistently for 6mo - 1 year as your credit builds, paying it off in full each month.
Apply for a better card with a larger credit limit. Keep spending below 15% of your credit limit outside emergencies, and don't spend more than you can afford.
When the credit limit is high enough you can just use credit cards for near everything, just keep it below 15% and pay it off.
Reap small rewards, while gradually growing your credit. Depending on the card you're using, it can be a few percent of all your spending back in your pocket.
People on this form will tell you credit scores are useless, that's only true if you're already rich.
Otherwise, you'll need it for renting an apartment, or getting a mortgage, not to mention you might want a car loan at some point.