How do i learn to do proper commenting in my projects?

Welcome to devRant!

General advice:
Don't explain the language.
If you're using an abbreviated variable name usually good to comment explaining what it's abbreviated.
Doxygen is important, basically function documentation explaining input/output/purpose of a function when not apparent from the function name.

Something you'll learn from experience. Go find some code you wrote 6 months ago and try to work out what it's doing. Anything that's hard to work out should have been commented.