If you level up and are unsure where to spend an attribute point on, better to not spend it.
Later on bows and crossbows require more dexterity (in my current playthrough I'm at level 13 and bows need 10 dexterity to be used) and melee weapons and armour require more strength (I have an armour that needs 12 strength).
Unfortunately (although understandable) the game doesn't really give a lot of attribute points to spend.
10 attribute points in 20 levels according to some site I checked. 44 skill points (or 63 when lone wolf) and 5 talent points.
