A few words on Git. 

Git: See all changed files on a branch

VS Code and GitHub - YouTube 

Tree for GitLab

Browser extension that makes navigating a GitLab repository feel like a breeze by providing a familiar tree structure.

Chrome Extension

Firefox Add-on

New Features

• Comes with Git v2.28.0.
• Comes with subversion v1.14.0.
• Comes with the designated successor of Git Credential Manager for Windows (GCM for Windows), the cross-platform Git Credential Manager Core. For now, this is opt-in, with the idea of eventually retiring GCM for Windows.
• Comes with cURL v7.71.1.
• Comes with Perl v5.32.0.
• Comes with MSYS2 runtime (Git for Windows flavor) based on Cygwin 3.1.6 (including the improvements of Cygwin 3.1.5).
• Comes with GNU Privacy Guard v2.2.21. 

It provides all the features available in the GitHub plain-text editor, including Markdown input. For features like tables, it offers a much easier experience in comparison to plain-text Markdown and allows users to be more productive.  

A source-control branching model, where developers collaborate on code in a single branch called ‘trunk’ *, resist any pressure to create other long-lived development branches by employing documented techniques. They therefore avoid merge hell, do not break the build, and live happily ever after 

An interactive git tutorial meant to teach you how git works, not just which commands to execute.