what is the best way to remember/manage/save code you will need again f.e. install anaconda on Linux

I m doing my first steps on Linux and I know I will need to look up a lot of installation codes I already made ones but will have to do it also on another VM. What is the best way to save the snippets to find them later faster and no need to look them up again on youtube? Is there a nice way or do I just save them as .txt-files in my folders? THX