Markdown checkboxes are readonly, this meas if you want to tick a checkbox you have to make own copy of the repository (fork it) and then edit a particular checkbox.
You must undesrstand basics of Git to be able to follow the instruction below.
- Fork the repository on Github (once)
- Checkout your repository (once)
- Change checkbox from
[ ]to[x]next to the topic you've finished.- before
- after
- Commit and push changes.
- Periodicaly pull changes from original repository to get new topics and materials.