Looking at Pictures
A lot of learning molecular biology is looking at pictures. The last 60 years has produced very instructive pictures of the molecular machines that underlie biology - that constitute the secret of life - and the best way to get an understanding of how they work is to spend a lot of time looking at those pictures and understanding how they work.
Some other branches of science are pretty picture oriented too, though I can't think of anything to match molecular biology. Fluid dyanmics comes to mind. Every would be fluid dynamicist should spend a hundred or more hours looking at pictures and movies of fluid phenomena.