As for the tutorial, i think John's guide covers most anything you may need (but may spoil quite some things as well).
Flannans guide contains less spoilers and just retains mostly just basic information.
If you do feel that either guide could use something extra/specific, I doubt any of the two would take it negatively, so feel free to go let them know!
(If they do, apologies
![Hide The Pain :HideThePain: :HideThePain:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
still doubt they will take it negatively though)
If you die, you loose around 5-10% of your current exp IIRC. Unsure for villagers, but might be the same there.
Additionally, if you do wish for higher level followers that can assist you with fights, raids can be useful and it can be good to beat those raids. As for when you have friends, they may be the target of a raid and when they get beat up they may be captured.
If you then fail to rescue them, you'll loose them, but you could theoretically also just have them set as survivor, not taking or dealing any damage... so yeah, there's no real downside to just ignoring raids.
It's still an interesting aspect to plan around and increasing raid levels, attempting to have your villagers defend themselves.
Walls can be useful as you could also keep an entrance with a wall "around" the entrance (so you have to curve around to exit), NPCs don't have any real form of pathfinding, so they just attempt to walk straight and attack what's in their way (walls, trees, etc.)
To my knowledge she's just
not yet in the game, but it's planned.