How to learn reverse?

Question

C++ / C#

Where can I start learning, what tools are better to use? Interested in various operating systems. Knowledge of the necessary languages ​​(C, Assembler) I mean the passed stage. I consider free and paid resources.

Answer 1

If you get someone else's product, and you need to fix something in it - read the code, understand it and fix it.
Reverse engineering is the same, only there are no source codes, you have to deal with ready-made executable files using debuggers, disassemblers, analyzers.
And therefore, you need to learn how operating systems, standard libraries, protocols, deeper assembler work.
And a lot of development experience - it's impossible to be a good reverse engineer and not just be able to program well - you have to imagine how the program looked like only from its compiled and working part.
PS If you look at your questions, then there are doubts that C and Assembler you have passed the stage.

Answer 2

You can start with various crackme and master debuggers, disassemblers, etc. The best resource is probably to start learning https://exelab.ru/ . There are tools and articles on how to master them... I think that's enough for a start...