Giving friends temporary access to your Mac without also giving them access to your own files is something you may need to consider one day.
You can allow guests to log into your Mac without creating any accounts or changing your machine. Check out sys prefs -> Accounts. make sure you can make changes (click padlock icon and enter your admin password)
You should see a list of accounts, one should be the guest account, click it and see what appears. “Enable the guest account so that friends can temporarily log in to your computer. Logging in to the guest account does not require a password. Users cannot log in to the guest account remotely.” “When a guest user logs out, all information and files in the guest account’s home folder are deleted” .
You can also choose whether you want guests to be able to connect to shared folders or not.
