You get development points by training on the Karin tower developing.
While training developing you get development points - you can use them here by entering command [!develop skill_name, count]
You can check info about developing by typing !develop
ki damage - +0,2% ki damage per skill
ki absorb - +0,1% ki defense per skill
physical absorb - +0,1% physical defense per skill
strenght - +0,2% meelee damage per skill
vitality - +0,2% health points per skill
energy - +0,2% ki points per skill
critical damage - +1% to critical hit (based on 200%) per skill
NOTICE: All skills have limit 100.