i did not real all of the above.
But yes you can play the game in a peacefull way but there will small animals like boars and small greyward that walk arround in the forest who you need to kill.. Typical they need 2-3 hits so nothing difficult.
However you will not get that far in valheim and unlock most things if you dont fight for it.
Example you have too kill the first big boss to get the tool to mine tin and bronze
( use bow arrow and run arround and shoot until he dies )
After that you can make the first metal and get a ship and unlock other things.
However to advance further you will have to kill boss 2 who give you a swamp key that unlock some crypts that have iron inside.
Technical speaking you can get some iron there without fighting but not so much.
Also the swamp is a very deadly area for new players without good gear so you have to run for it to find the crypt and take some iron and run home.
( prop tip.. dont park your ship near the swamp its gona die, park it a little way away from the swamp area and run to the swamp.

But yes you can go exploring and the game can be peacefull, however i dare to say its more combat focused than its peacefull since you run into creatures everywhere.
But you can build a big base mostly peacefully.
But in general you have to fight to advance and unlock many important things.