The initial raise you choose varies and depends on position , the players you have in front of you on the table and other factors .
If many tend to limp in your good hands raise more bb .
If they are passive , don't change style , keep pressing them .
3x is the standard ,change it to 3,5x or 2,5x sometimes .
When you have a good hand raise more to protect it , sometimes raise more with not a monster to mix your game .
Try to control the pot and the action with the right raises at the right spots the right time.