How to configure linux so that there are several users on it and each has its own rights to projects?

Question

linux

The task is as follows - I deployed a simple web server on a vds-ke in order to test projects with colleagues. I would like to do this - create 3 users, separately display a folder with projects (each project is a subdomain on the server) and, depending on whether a particular developer participates in the project, give access to it. For example, only participants can be allowed to write to a project, and everyone can be allowed to view it. Or not to give at all, if not involved.
Is it possible to implement this without dancing with tambourines? Which direction would you recommend looking?

Answer 1

As an option - do not let them on the server at all.
Set up uploading projects through GitLab, for example, and use it to resolve access.

Answer 2

What do you call "dancing with a tambourine"?
I would make a group for each project and list them as the owner groups of the respective project directories. Then, if necessary, I added users to these groups