Hey @GearStarter welcome to the Community Forum 😄
GitHub has a 100GB a storage limit for your repository. If you have large files (more than 100MB each), then you need to configure your Git (locally) and prepare the repository remotely to support Git LFS (Large File Storage)
You can check the guide here https://help.github.com/en/github/managing-large-files/configuring-git-large-file-storage
Also check the Disk Quota here https://help.github.com/en/github/managing-large-files/what-is-my-disk-quota
I do not believe you ca exceed 100GB.