[Pip Boy]

Originally Posted by EVILNess

Throw them in jail constantly. It keeps them in line.

Seriously though? Consequences and that actions have reactions are the two biggest things you have to teach a PC. Hell, even seasoned players tend to forget their characters are squishy dragon snacks if you let them get away with being a Mary-Sue.

This is something I'm working on emphasizing a lot in my side-quest section. Some of the quests are straightforward, like the players just going and rescuing a girl from a cave full of orcs, but some of them are less straight forward. For example, the man who paid the PCs to rescue that girl wasn't really her father. He was a necromancer who wanted a little girl to experiment with. Completing the quest without asking the right questions to the right people will lead to a dead little girl.