You are declarer about 25% of time.
You are defender about 50% of time.
But you bid on every board. With accurate bidding you don't even need to play that well although for best results you should know more than the basics Same in defence. Bid well and force opponents into a bad contract. Bridge IS bidding, a kind of language between 2 people. Practice your bidding language skills here at Bidding Quest. It is the path to becoming a better bridge player!