There are lots of ads for sites that say they can give you your credit report, but be cautious; there is only one that truely gives you your reports for free...from all 3 credit bureaus. You can get a free copy of your credit report once a year, from annualcreditreport.com. A good way to keep tabs on your credit is NOT to pull all 3 reports at one time-once a year, but to pull a free credit report every 4 months from 1 of the credit bureaus...and keep rotating. This way you'll be able to see a credit report for free 3 times a year.
Be aware...this doesn't include your credit score, which is what people look at to decide whether or not to loan you money or charge you a huge deposit.
If you want to find out your actual credit score, try quizzle.com or creditsesame.com. Both are legit services, and they're both completely free. BUT...They use your credit history to try to sell you financial products like mortgages, credit cards, etc. though, so be wary.