We all have to learn new things when dealing with computers. Sometimes the steps involved are pretty complicated, and I have found that in practically every situation whatever document or site I am using to perform the steps, has errors. It's not complete, the author skipped an important step, and so on. For these reasons and others, after I have (finally) gotten something to work, I run the history
command in that session and output it to a file. I then save this under a suitable name so I can find it again later.
Depending on how much effort was required, and if appropriate, I may take screenshots of each step as well. This can be valuable later as a reference, and if you ever have to help someone else accomplish the same task. Or, if someone talks you into writing a book about it someday.