What's a preconception you had about writing that was dispelled as you became more experienced?

It could be something like, "I thought XYZ was easy and ABC was hard, but--"

Or it could be something where you thought you HAD to do something one way (organize, use a certain program, write in a certain POV, etc), but you ended up handling it in a fashion that was different once you became experienced enough to see things differently.

What preconception was dashed as you grew in experience and skill?