Common fees will include a set-up fee, a leasing fee for each turnover or a lease renewal fee, marking up maintenance, retaining late fees, and more.

Understanding the nuances of the "A to B, B to C" close, the contracts including assignments, what types of financing one can get for each property, etc.

It's a split level that I bought in original condition, including a 1984 ancient-looking air conditioner and all the things that come with a house of this nature.The plan was to do a full cosmetic + replace HVAC and Roof + prune back 60ft tall pine trees AND turn it into a house hack bnb.What I've learned so far....- Trust but VERIFY everything on the buy side.

All our rental units, including our small units, have tanked water heaters.  

Some of those include Liability. 

As far as negotiating furniture, I would include “furnishings negotiable” or “comes furnished” in a contract.

that we’ve learned in our 24 years, managing almost 700 doors across the Metro Detroit area, including almost 100 S8 leases.

What could I expect to cash flow per year including on and off season?

People want flexibility, mobility, convenience, and automation...including residents, not just travelers. 

The BiggerPockets podcast and resources, including books by J Scott, are excellent tools to learn from seasoned investors and gain valuable insights.Utilize BiggerPockets Resources: Make use of the podcast, articles, webinars, forums, and other resources available on BiggerPockets.