Sharing / Permissions nightmare

File Sharing in a Mac is essentially logging into the Mac and using it remotely.

The best place to share is in the /Users/Shared folder. You can make a new folder inside of that or just share it out. It depends on what you want to make available to others.

Staff is the group that all local users are part of.

everyone is the Apple name for the Unix POSIX permission for Others. Others are users who are not the owner of the file and not in the same group as the file.

You can make sharing only users that gives them a username and password, but no login account. They can access whatever you give them access to in Sharing.

4. is your best bet if you have multiple users. You can create sharing only users and put them in the group.

You have to fix the ownership problem with Access Control Lists (ACLs).

You can add this entry to the folder so that users can edit any file created by any other in the group:

https://apple.stackexchange.com/questions/5689/permissions-for-new-files-in-shar ed-directory

Instead of using staff like they did, I would create a new group in Users & Groups and use that group name instead. Also, for the folder you are sharing, set the group to the new group name. You can do that in Finder, Get Info. Delete the staff group (or whatever it is in the subfolder you create), then add your new group.

Now, the questions:

1. Wich type of folder is best to share: a random one or my public folder?

What every you like.

2. When i share a folder (on the preferences "sharing" panel), it comes by default sharing with me, "Staff" and "everyone". Who is "staff"? Who is "everyone"?

every macos user has a user id. Every user is a member of a group. Everyone means any user on your system. This stuff my only apply to local users.

You need to click on options to see the screen below.

first off, If you want to share with windows you need to user SMB. You may use SMB for macs too.