Originally posted by Lemur:

I wonder, if i level any kind of skill like swimming, running woodcutting
Do they reduce stamina usage?
And does skill axes, spears, swords
Does the same such as reduce stamina usage and add some dmg too?

Cus from long time being in game, i didnt notice anything what leveling those skill gives me something.
Only upgrading or creating new items changes something (mainly dmg)

Do anyone can explain what benefits i do gain when leveling those skill?

You get miniscule gains that are not really noticeable until near max stats. Its really bare bones of a skill system that will maybe change in the future so like someone mentioned before better to just ignore it and play like it doesnt exist.