GitHub: Q: How to Create a Central Repository and Provide Access to Team Members

Answer: Recommend create a GitHub organization and add all members there.

Create your own Organization.
Create a Git Repository.
Add the required user IDs and provide access permissions via:

Settings >
 Collaborators & Teams (Left Tab) >
  Collaborators >
   Enter user ID and click Add Collaborator

To add a member to a particular team rather than adding them individually to a Repository you can:


Git ML Right Side top & click on Settings
 Collaborators & Teams (Left Tab) >
  'Create New Team' and add your team members user ID there

High level Repo setup is now done. Now modify the structure (Branches, Folders etc) according to project management.

Check out:

1) What Is GitHub? A Beginner’s Introduction to GitHub
https://kinsta.com/knowledgebase/what-is-github/

2) Hello World - 10 minute read
https://guides.github.com/activities/hello-world/

3) Understanding the Github flow <---
https://guides.github.com/introduction/flow/

4) Explore GitHub
https://github.com/explore

5) GitHub Guides
https://guides.github.com/

6) GitHub Training & Guides
https://www.youtube.com/githubguides

7) GitHub Learning Lab
https://lab.github.com/

...

More Git/GitHub Questions and Answers:

Git as well as GitHub support large files using LFS (Large File Storage).

Using GitHub.com, each file size can be up to 5GB depending on the version being used:

About Git Large File Storage
https://help.github.com/en/github/managing-large-files/about-git-large-file-storage

If using an internal instance, it will need to have LFS support installed.

Configuring Git Large File Storage
https://help.github.com/en/github/managing-large-files/configuring-git-large-file-storage