Joining a writing organization, critique group, or online gathering can help you to polish your work, whether fiction or non-fiction. Also listed are organizations that watchdog the writing industry.
ACFW [American Christian Fiction Writers]
AAR [Association of Authors’ Representatives, Inc.
MWA [Mystery Writers of America]
P & E [Predators and Editors] watchdog organization
Poets.org [Academy of American Poets]
RWA [Romance Writers of America]
SFWA [Science Fiction & Fantasy Writers of America]
WWA [Western Writers of America]