Version control is a very broad concept. Which do you mean?

Version control for plugin code can be done on many platforms like GitHub, GitLab, SourceForge, etc. If you want to know how to use those search on their websites.

If you mean easier management of how your plugins and Elgg are installed on your website you probably mean Composer. Check their website of how to use that tool https://getcomposer.org/doc/00-intro.md

When using Composer to manage you plugin versioning have a look at the Elgg starter project for a good basis on the initial Composer setup. https://github.com/Elgg/starter-project

You can also put your Composer configuration (based of the started project) in a code versioning system that way you can easily revert changes.