You don't have to manage every user's permissions individually, you can assign permissions to a team. Every team member will then inherit those permissions.

1. Select Launchpad > Go to Admin > Teams > Internal Teams or External Teams.
2. Select the team to which you want to assign permissions and click on its burger menu. (We strongly recommend that you only apply permissions to access control teams (ACL), signified by the lock icon)
   
3. View/Edit Permissions You could manually add permissions to the team here, but we recommend using a permission set as it makes permissions management much easier. You can assign a default permission set or learn to create your own here: Create a permission set.
4. Click on the Permission Set icon > click the burger menu of the permission set you want to assign > Apply Permission Set.
   

Review

You have now successfully assigned permissions to a team, all the members of this team will be granted these permissions.