How to find where the key is checked?

Question

reverse engineering

Hello. I would like to learn how to debug programs. So what I did:
1. Downloaded x64dbg
2. Wrote a program with key verification
And then a lot of questions. Everywhere they introduce you to a debugging course, they look for jumps, checks with a keyword, for example "Key, not valid". No matter how many programs I opened, I even wrote my own, I could not find the lines from the program. One would assume that they are protected by something, but my program is simply compiled.
What if I'm doing something wrong? Didn't find much information on this. Where can you read?

Answer 1

wasm.in in publications
Introduction to reversing from scratch using IDA PRO
Introduction to debugging from scratch using OllyDbg

Answer 2

Do you even understand assembly language at least a little?
Computer architecture?
Trite - in what encoding were you looking for the key phrase?