Hello,
I bought a smartphone /e/ (samsung s9+)
I would like to root my smartphone, with the official module of lineageos (https://download.lineageos.org/extras) or with magisk (https://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445).
have any of you ever succeeded?
when I boot on TWRP, it asks me for a password I don’t know what to put.
I encrypted my phone, but my password doesn’t work.
thank you for your help
SOLVED ! 
I actually rooted my phone very easily with this magisk ( got github topjohnwu/Magisk)
in TWRP, when asked for a password, just press cancel, install the.zip, and that’s it.
result: I can use Yalp with the installation in root mode
before that, I couldn’t get spotify to work, especially
Now it works!!!