If you wish to help mantain, update, or fix the information in this repository, great! Please feel free to suggest external resources and sample problems, suggest typo fixes, etc. There are two ways you can contribute.
Create a new issue and assign the appropriate label to it. I will get around to looking at your suggestion/fix and implement any changes if needed.
If you want to dive into the repo itself, awesome! Clone this repository, make any edits, and submit a pull request. I'll review the request and merge if I approve.