If it is too difficult to remember a password use a pattern instead. Unfortunately there is no way to enable fingerprint only access. Android will not allow biometric unlock only. Not to be funny but you would have to get an iPhone for that.
Best wishes
Right, but at some point something other than biometrics is needed. I'm pretty sure with iPhone you can just set Face ID and that's your ticket in power on, unlock and everything. Android requires pass, pin or pattern for power on and randomly, at least with Samsung. If I check the time or notifications too many times I'll have to use my pattern when I actually want to unlock the phone.I'm using fingerprint only on the S9+. After a restart I need to enter a pattern or password.