New answers tagged access
This is very easy to do. Just select a folder/library and hit the "share" button. Simple. Though, check out Office 365 Groups, as they provide essentially a team site with pre-baked functionality. It may meet your needs better than a customized team site.
You can set a group as a default group of the site. Doing this would make the group appear by default when a user requests permissions to the site. If you go to Group Settings, there is an option to set Group as default. You can also change the permission you give to a user by clicking on the ellipsis shown next to the user. Source: ...
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