• Git is a version control system that tracks changes in files. 
• GitVerse and GitHub are the platforms for collaborative code work.

Git documentation:

• A book about Git from official site: here
• Official Git documentation: https://git-scm.com/doc
• Interactive tour through major features of Git: https://try.github.io
• Course on Git on Stepik platform: https://stepik.org/course/48/syllabus
• Learn and play (a game to learn Git): https://learngitbranching.js.org/?locale=en_EN