Seat post tightening
In this manual, they state the torque for the Giant Defy seatpost should be around 50kgf-cm (5Nm). I know this is for the carbon frame, but they should be similar.

You can buy a torque wrench for around $30, which you should, because otherwise there is a high chance you will under or over tight it. I know $30 is a pain in the ass, but think this will keep your $1000 bike running smoothly for a long time.