Teams make it easier to setup and organize access to repositories.
GitHub Help: Creating a Team
You can be a member of a multitude of teams. At GitHub, I’m a member of project teams based on the projects I’m working on, I’m a member of functional teams like “engineering”, and I’m a member of affinity groups like “all remote workers”. There is no limit on the number of teams you can have so use as many makes sense ensuring that each team is “mentionable” in a meaningful way.
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