Do I need to check my credit report every month?

Once a year would be good. But you must also check your score every time before taking out a loan or credit card. Make sure you pull out reports from at least 3 major credit bureaus - Experian, Equifax, and TransUnion.

No, you can check your credit report once a year. But if you see that your credit score suddenly drops, then you should check your credit report to see whether or not there is any dispute.

You need to check your credit report at least once a year. However, you should your credit reports before taking out a loan, and if you feel you've become a victim of identity theft.
While checking your credit reports, make sure you pull out reports from at least 3 major credit bureaus - Experian, Equifax, and TransUnion.

Make sure you also check your credit scores along with checking your credit reports.

It's best to check your credit report once at the end of every quarter. Technically, this means that you have to check your credit report at least 4 times in a year. You can get a free copy of your credit report from the annualcreditreport.com.