There are so many resources for writers today you simply need to use your favorite search tool to discover them. This is a sufficient starter set.        

Dictionary.com

MerriamWebster

The Ultimate Internet Slang Dictionary

Urban Dictionary

https://www.thesaurus.com/

https://www.merriam-webster.com/thesaurus

https://www.macmillanthesaurus.com/us/

476 Ways to Avoid "SAID"

The Texas Handbook (The Texas State Historical Society)   

Library Of Congress

Internet Archives Including WayBack Machine

Zotero - Personal Research Assistant

Europeana

Project Gutenberg

The Elements of Style by William Strunk, Jr.   https://www.bartleby.com/141/index.html

MLA Style & Handbook

Grammar Girl by Mignon Fogarty   https://www.quickanddirtytips.com/grammar-girl/

Properly Capitalize a Title   https://capitalizemytitle.com/

Free Grammar Checker

Grammarly  - Grammarly is an American cloud-based typing assistant. It reviews spelling, grammar, punctuation, clarity, engagement, and delivery mistakes in English texts, detects plagiarism, and suggests replacements for the identified errors. It also allows users to customize their style, tone, and context-specific language. Wikipedia

Amazon KDP Publishing

Buy your own ISBN numbers from Bowker

Amazon Vella (for serials) Discontinued by Amazon

Barnes & Noble

Blurb Bookwright

BookBaby

Blogging Platforms:

Wordpress

Tumblr

WIX

Copywriting 101