Learned weak NT to start then Acol, then SA, then Precision and then 2/1 (the easiest to learn as more of a treatment). Now try for 2/1 and Precision but often get stuck with SAYC. Recently learned Mosca club with canape and Polish club.

Book i learned bidding most from Precision Bidding in Acol by Eric Crowhurst

Redoubled with overtricks:

2D+2, 3N+2, 4S+2, 2S+3, 1N+3, 1S+3, 2H+4, 4S+1, 4N+2