Board Thread:Theories and Speculation/@comment-31338621-20190501030435/@comment-31338621-20190506172614

Increasing knowledge of jutsu can improve level. Ebisu who's an expert teacher advocated for Konohomaru learning 1,000's of jutsus to become hokage level IIRC and the 3rd became a strong kage level doing just that.

Orochimaru thought that he could make new jutsu by combining jutsu he learned previously and he advocated for learning a lot of jutsu.