Most banks pay little or no interest to their customers on their savings. Some banks even charge account management fees or negative interest. The stock exchange is a very safe alternative. However, if you put all your money into a few individual stocks, you risk high losses when prices fall. It is therefore better to spread your money widely across the entire market. However, this does not require the expensive purchase of countless stocks, but can be done from 10€ per month via savings plans on ETFs. ETFs are exchange-traded funds, i.e. ready-made packages with numerous stocks on specific topics that can be purchased cheaply.
With a FIDO2 stick like the Solo V2 it is possible under Linux to log in by just entering a PIN and tapping the FIDO2 stick. This new type of secure and user-friendly login is made possible by the Pluggable Authentication Module (PAM) for the Universal Second Factor (U2F) for short pam-u2f since version 1.1.0.