Useful tools for writeups?

I want to make a few writeups, what is a good screenshot program to use? And any tips on how to get whats on the terminal to look nice in a pdf? I've seen some really good writeups with line numbers and stuff, but not sure how they do it. Any other general tips would be really nice, I've never created a pdf before, are people just writing these in word or simple text editor?

sorry for such a basic question



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