The best way to contribute is by making sure links to learning resources and information in the repo are correct and up to date or extending the repo by adding new resources.
If you find incorrect/broken link or wrong information in the repo, please submit a bug under Issues. Before you do please make sure that bug wasn't already reported and use "bug" label.
You can contribute to the repo by adding new information (either in the form of links to existing resources or submitting something you have created). A few simple rules to follow:
- diagrams should be written in PlantUML
- diagrams should be rendered via online PlantUML proxy server (see existing diagrams as an example)
Thanks and best of luck with the exams :)