Tom Sloper: https://www.sloperama.com/mahjongg/ My MJ Guru! His weekly strategy column is great for beginners.  The Q & A Bulletin Board provides a place to ask Tom your question.  He normally replies very quickly.

Mah Jongg Diva Magazine:   https://myemail.constantcontact.com/MJ-DIVA-MAGAZINE-ISSUE--9-February--2021.html?soid=1132536188535&aid=QauGu9f9hOw  A wonderful periodical with lots of good information.  The founder, John Davis is an accomplished arist with many creative Mah Jongg renderings.

Gladys Grad: https://mahjonggandme.com/tag/gladys-grad/ She is the Mother of Siamese Mah Jongg.  Additionally, she has a good monthly newsletter.

Mah Jongg That's It:  https://www.facebook.com/groups/MahJonggThatsIt/?multi_permalinks=4083792921665523&notif_id=1613092248077498&notif_t=group_highlights&ref=notif   If you are a facebook user this is a place where 30,000 + people post and share MJ information.

Modern Mah Jongg:  https://modernmahjong.com/ Dara and Donna are cofounders of this business.  They sell special dice, accessories and even an a replica of an iconic Mah Jongg set.  But they are more than a businnes.  They connect the Mah Jongg community with webinars at various times of the year which are uploaded to youtube after the presentatios, and sponsor tournaments.  In addition to their webiste they have an acitve facebook page:   https://www.facebook.com/groups/mahjongcommunity

Books:

"American Mah Jongg for Everyone" http://americanmahjonggforeveryone.com/ The newest book on beginning Mah Jongg.  This is a must for any beginner or teacher.  Gregg Swain and Toby Salk have written this landmark book that is informative, creative and has a sense of humor.  Great graphics and pictures by Gregg's husband Woody. 

Mah Jongg:  The Art of the Game http://www.mahjonggtheartofthegame.com/  "Mah Jongg: The Art of the Game is the first book to fully capture the story of the exotic and exciting game of Mah Jongg, offering an intimate look at the history of the game as well as the visual beauty of the tiles."  You will love the beautiful photos of so many different sets!