In character-building/leveling-up, you take your class's skill points and add your Int bonus. So a Fighter gets 2 Plus their Int bonus. Say my fighter is really smart(16) he'll get 2+3 (int bonus) or 5 points per level.
But what if my fighter is dumber than a sack hammers? Let's say int 4. He levels up and gets 2+int mod. Int 4 carries a -3. So it's 2+(-3) which equals -1. How does a dumb fighter level up any of their skills if they have negative skill points?
Or is the int bonus only added if it's positive?