1.A player should expaned his/her position where he/she stands better.
2.A player having pair of Bishop should try to open up the position by advancing the pawn & exchanging the pawn.Where as a player having pair of knight should try to close the position.
3.If the king are castle on oposite side we should try to open up the position advancing the pawn, opening up the files while attacking, identyfy the main defenders than try to drive them away,cut off or exchange.