I have been a limited partner in 65+ deals over the last 5 years.I wanted to gauge potential interest for other potential limited partners in building a free community (Skool or Slack) that focuses around education for the limited partner. 

No one can answer questions like this because the strategy depends on the investor's level of interest, financial framework, location, and many other factors.

You will be able to take advantage of it in a SDIRA if the syndication also has taken on debt and therefore passes UDFI on to your account. 

Any opinions on short term vs long term rentals? 

I've reached out to my local group for recommendations on where to go from here.

I would recommend them to get you set up for seeing all future bookings, the listing info and data, etc. and have them deal with it or simply ask them to switch their STR software to another platform specifically for those units under management...

My spouse and I purchased a home in Nov 2023 (that we will move into in about 1.5 years), that has an additional 2 bedroom apartment and 1 bedroom studio on the property.

My opinion on this would be to add it if you want it for yourself while you still live there, otherwise I wouldn't bother.

Does anyone have any good recommendations on books or accounts I can follow or read to learn more? 

I currently have a loan with a HML at 10.5% on a 6month term.