SPUTTERGRUMBLENANOMETER Or can do apps harm without any permission?
If you don't give it any personal info or login info, and you don't give it any permission to access other stuff because it doesn't even request permissions, then it's perfectly safe. But if you give it any personal info about yourself, you'll have to trust that the app isn't malicious.
SPUTTERGRUMBLENANOMETER Would it bee saver to install these apps in a secondary profile?
I answered you in your other thread about this.
SPUTTERGRUMBLENANOMETER How can i make shure a app is safe to use? Becouse its not very like its compromised or has malware etc.
You can't really ensure perfectly that the app is safe. But if you scan it with an anti-malware scanner like Google Play Protect then it might not be a malicious app, and if you don't give it info you don't want it to have about you and don't give it permissions you don't want it to have, then it won't have that info/access and should be safe.