True!
And write a few hundred more after that and you may tire of the whole business and decide to do something else with your life entirely.
I'm a writing coach and editor-for-hire and I'm hee to say that all of this advice is sound, and if the writers I work with came to me already knowing these things, it would make my job as an editor much easier.
On the other hand, if every writer knew these things and put them into practice, that could put me out of a job!