I’m a former CPA and tax accountant (two separate credentials – not all CPAs do taxes). I don’t do client work any more, but I can point you a couple of places.
I highly recommend going directly to the IRS site or to a licensed tax preparer / tax accountant with your tax questions. Two people who appear to have different jobs can have entirely different tax pictures depending on their their income, marital status, whether they itemize, etc.
Here’s where to get your basic information