Bonus* as far as strategy goes high rhythm and passing tends to work for me reducing kicking though otherwise players like to kick ball away frequently. Edit individual players tactics also alot forget to do this and it does help.

Regarding the strategy building I've been told in game it adds to your players game rating not thier base rating outside of it. Aka a +5* bones gives all players that bonus in a game but your opponent gets same benefit to whatever thier strategy buildings are.