In the stock market you're not exposed in this way as you'll be invested in all the publicly traded companies out there across different sectors, which often move in non-correlated ways.

The trade off would be she won’t pay rent in my unit, which is currently up for sale.

HelloI hope you are all doing well!
I am about to place an offer on a new property than can really unlock great cashflow, and push me closer to my goal of being financially free/independent. 
I am undecided about ho...

To open a DBA bank account and such you need to file a "trade name report" which is $25.

But if you're unable to figure it out from the vast online resources, haven't met people doing it through REIA and trade groups you probably lack what it takes to be successful at it.

To qualify for a 1031 exchange, the properties you sell (relinquished properties) and the property you acquire (replacement property) must be held for investment purposes or used in a trade or business.

I also invest in stocks but I missed the  opportunity with Bitcoin and NVDIA.

To qualify as a real estate professional, a taxpayer must meet the following two criteria (IRC Sec. 469(c)(7)(B):More than one-half of the personal services performed in all trades or businesses by the taxpayer during such taxable year are performed in real property trades or businesses in which the taxpayer materially participates, andSuch taxpayer performs more than 750 hours of services during the tax year in real property trades or businesses in which the taxpayer participates.You must also meet material participation requirements for each rental (or group the activity). 

Time is a currency and they are trading the most valuable one to save the least.

I did a 1031 exchange a couple years ago and traded a rental duplex into a single family home that we rented out near the beach.