Generally, a queen is considered to be worth more than a rook and a bishop. Also, knights and bishops are worth the same except they are not. Knights are good

Generally, a queen is considered to be worth more than a rook and a bishop. Also, knights and bishops are worth the same except they are not. Knights are good in closed play but you can't mate with two knights and a king. Bishops are definitely better when there is more space. But, the value is just a simplification to help players assess situation. A piece which can't be played actively is worth nothing.