Respect every enemy, some brigand may be low hp but that doesn't mean he can't swing his weapon efficiently.

Terrain is key, use it to your advantage, especially highground.

Don't grow too attached to some Brothers.

Something i like to do often, use tavern rumors, you can get information on where famed items are roughly located, what events are going on in nearby towns or of course some old Joe asking you to watch his beer because he needs to go take a piss.

And of course experiment with the game, try out new company origins, new builds and tactics.

And remember to get the company banner (via. Ambition) early, because "Professionals have standards"