Using git for version control in KiCad

I haven't tried it but Helix Core is free and unlimited for up to 5 users.

https://www.perforce.com/p/vcs/vc/free-version-control?utm_source=googleadwords&utm_medium=cpc&utm_campaign=VCS-Version-Control-Search-NA&utm_adgroup=Version-Control-Trial-NA-Search&utm_term=version%20control&gad_source=1&gclid=EAIaIQobChMImvPMjovGhgMVW0b_AR2GAQYjEAAYASAAEgKm1vD_BwE

Apparently it works well with git...

Perforce Helix Core is an alternative to Git rather than working with it. It tends to be used in video game development because it's supposed to handle large binary asset files better. It's awful, and reminds me of how source control used to be in the 90s. I strongly suggest avoiding it.

If KiCad projects are text files - which I believe they are - then Git will work fine. There's a bit of learning curve to Git if you stray off piste or make a mistake, but it's the industry standard for a reason.

I’ve not used git with Kicad but I see no reason it wouldn’t work if it’s just you using it.  If it’s a team and you share and work on the designs then it may be an issue keeping the project file in sync, best you could do is try it and see.  There are no direct links between Kicad and git so you can’t manage it with Kicad and instead will need to use an external mechanism: command line (blech!) or a gui tool such as GitKraken.  

Which OS are you using?

Version control can be used for anything, I believe KiCAD has mostly text based source files, but even binary files can be versioned.

What difference does the OS make? KiCad and Git both run fine on Windows and Linux.

Yes - Git handles binary files just fine (and even large ones well now). It's only really merging that's the issue with binary. That's unlikely to affect solo KiCad projects.

The difference is in the installation and usability.

In most Linux distributions is installing git matter of one command, setting, two commands, and creating repository one command.

https://git-scm.com/download/linux

With Windows, Next > Next > Finish installer with some not so obvious questions needs to be run (adding to path, selecting line ends - because Microsoft always wants to do things differently, installing terminal emulator! ).

https://git-scm.com/download/win

For me and many coworkers it was easier to use Windows Subsystem for Linux and manage version control from this virtual environment even on the Windows drives.

Anyway, I recommend starting here: https://git-scm.com/book/en/v2

I also forgot to mention OpenSSH, OpenSSL and Credential manager installation on Windows. I know, all is embedded in the installer, but many new users get stuck here, installing tools that are standard in Linux distribution and installing this to Windows.

Although I have no fear of the command line, there is a very simple interface option for Windows that I have used for a long time.

TortoiseGit – Windows Shell Interface to Git

If you want to have a fun time learning git, this is a little gem:
https://learngitbranching.js.org/

I just tried this, the look is great, but not sure, if absolute beginners will get it. 

The first exercise is about creating commits - just type in "git commit" twice to finish. - This NEVER works in real life, see here: https://git-scm.com/book/en/v2/Git-Basics-Recording-Changes-to-the-Repository

So I do not recommend this.