I'd suggest posting your location as prices will vary depending where you are (as will usage of the HVAC).The price difference is quite a bit. 

Rents will go up and your biggest mistake was to buy a nice house in a desirable neighborhood.The real threat is buying in the hood, leveraged up to the gills, maybe even with hard money, tenants are bleeding you dry, while you are writing checks to attorneys and contractors.Milwaukee is getting a lot of attention lately: cash flow is still better than most places and appreciation is stable at 5-8%.

But the companies that are offering 3D homes seems like it could help solve the housing crisis in the long term.

Most PM software won't be worth the cost at this point depending on your budget.At this stage, a good ole Excel/Google Sheet will do for keeping up with your income/expenses.

If you buy the house, do you owe both a fee?

The person who found the deal, future partner, found it off market, turnkey, under market rents.

The borrowing against a 401k could potentially come in handy for a fix-and-flip or BRRR type transactions as you can quickly return the funds to the 401k.

Welcome to BP.I am not sure on the course offerings, but @Dave Meyer's latest book, Start With Strategy, would be a good primer that goes to the question you are asking.Are you talking about an overview on all asset classes or more of a how-to on getting started and prepped to invest?

I’ve focused on passive multi-family deals, and now I’m excited to share new syndication opportunities from experienced sponsors in the multi-family and manufactured housing communities (MHC) sectors. 

*Investor-Focused Solutions: Custom loan structures that make it easier to get deals done, from seasoned pros to first-time investors.I’m passionate about helping investors simplify the loan process and make smarter financial moves.