I feel bad for you that one dopehead ruined your whole life, so here are some tips to help you next time.

How to sharpen a photo: https://digital-photography-school.com/an-introduction-to-sharpening-photos/

How to compose a photo: https://www.wikihow.com/Compose-Photos

Understanding exposure in photography: https://digital-photography-school.com/understand-exposure-in-under-10-minutes/