[LINUX_Newbies] Two users on one computer

Good afternoon.
Now I am using
one user for one computer.
For learning Linux
how is the second user working:
1
I am booting
then I decide today
starting user1
and user1 is on and he can only use
file created user1.
Maybe busineness.

I am booting user2 for private emails.
Then every programme is new and empty
and there are separated files for every user.
Is this right?

Question:
How can I change from user1 to user2:
Shut down and boot again?

Regards
Sophie



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