Codecademy's Git tutorial - https://www.codecademy.com/learn/learn-git
Github Pull Request - https://yangsu.github.io/pull-request-tutorial/
Codewars - https://www.codewars.com
Atanas Semerdzhiev - https://github.com/semerdzhiev/sdp-samples
Kalin Georgiev - https://github.com/stranxter/lecture-notes
Daniel Isov - https://github.com/danielrss/SDA-FMI