I agree on all of the given tips, yet I’d slightly disagree here:
While you may read all of that in approx, one hours, it might probably take you longer to actually implement all of these things. For me, the whole thing is a mostly enjoyable learning experience so far, but things take time and my rsync-scripts alone had me vibe-coding an hour or so.
et, that was time well spent, because now, I have my backups and my snapshots and even my snapshots backed up and I can replicate that on any other system.
My answer to the original question:
If I do
sudo pacman -Syuand there are 50 packages to be updated am I supposed to do 50 searches on google or the arch websites??
is: no. You do all the things stated above and live happily ever after.
Counterquestion: Did you read every release note of every program you ever updated in Windows? See? Same here.
How do people here actually know if the next update is gonna break their system?
We don’t. We trust the process, but are prepared for hiccups 
PS: feel free to mark the answer you like most as “Solution”.