I’m not that desperate anymore. I’m using Arch on a VM just to test it and become more and more adapted, so i can finally migrate. I’ll test another Desktop Environment now, so thanks for your help.
And the best way is to arch-chroot and simply run: passwd username
But in case its only “normal” users password… you still can login via TTY as root using initial created password from installer… if both does stop working out of nowhere it wioll be more like something with keyboard layout or language settings…
And welcome here @Papito have fun and do not follow random tutorials… best is to ask here or at telegram chat just in case the fellow EndeavourOS user are always there to help!