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If your just starting out do youtube search for "photoshop playlist tutorial" then you will get a playlist of tutorials, you can add beginner if you want and see what comes up.
Once you get familiar do a bunch of searches. Usually tutorials will show what you will be creating at the beginning. If you like what they made, or think it looks cool, then do that one. Most people wont finish the tutorial they started so it's best to find one that you actually want to do.