Welcome - and a big thank you for wanting to contribute!
Let's get you started. Most of these projects are licensed under the Unlicense, while others are licensed under the MIT license. You should only submit code that you personally own or have permission to submit under this license - and only if you are ok with that.
- Make sure you understand the license in each project, and agree to the code of conduct as well as the Developer Certificate of Origin
- Submit a pull request to the relevant repository
- Wait for feedback from us, we should get back within a few days at most