Should you use comments on other coders code to help you learn?

Question

I had an idea which is once you have passed the relevant courses a good idea is to use comments on every line that was coded on other people's code to help you understand what happened on that line in that language

Answer 1

i find it better to retype others codes and anything I dont understand I google it.

Answer 2

comment can be used to explain the code created.
example:
// System is a namespace
// Console is a class
// WriteLine is a built-in static method
System.Console.WriteLine()

Answer 3

thank you zeron

Answer 4

thank you jay