A rook on the seventh rank is worth a pawn. Rooks belong behind passed pawns, of your own or the opponent. The king is a fighting piece and should be centralised and used actively. Try and gain tempi whenever possible, but without giving up material. Passed pawns must be pushed.
Rooks belong behind passed pawns.
In open or semi-open positions a bishop is usually superior to a knight. The knight is superior to the bishop in blocked positions or when the bishop is hemmed in by pawns on the same colour squares as the bishop.