Found on Twitter: Blanket Advice to Writers

Writing short stories is absolutely the fastest way to gain skill. Amateurs will say "but I only write novels!" Pros know better.
--Advice from a published writer, offered on Twitter

I am obviously an Amateur.
( Because having written over a dozen published novels clearly hasn't put me in a position where I, as the tweet says, know better )

Edited because "being" and "begin" are not the same words, even if they contain the same letters.