Vs trying to teach it to strangers. 

I would not want to get in a hot tub that hasn’t been cleaned after strangers have been in there and neither will your guests. 

I started renting rooms to strangers, and things got more interesting and more challenging quickly.

To keep it simple the blue states usually afford tenants the most protections so IL and NJ are no stranger to things like this, whereas Oklahoma and Wyoming might be. 

But even talking to a stranger about not being able to help him recover his life savings was among the worst conversations in our lives.

@Louis FernandesDo you really think someone would lend a stranger money at 3% when you could invest it risk free for 5%?

But I don't want to be living with strangers, I was thinking if I make my own room(something small like in the garage). and only sleep/be at the house half of the time will I still be considered a primary resident and will that be okay with FHA guidelines as long as I don't tell them?

Well, when it comes to filing taxes I usually don't rely on the kindness of strangers (especially when they have no liability), but if you think getting a lot of replies (some conflicting) will help you make up your mind - Have at it.Honestly, am not trying to be a jerk (as you can see it comes naturally), but your tax guy is the best liability shield against the IRS you have. 

And I assume, you're also fine with a PM sharing personal information with a stranger on their investments?

Everything costs more than you think it will, takes longer than you think it will, and exit strategies of selling or refinancing are a bit more complex and difficult than strangers on the internet make it seem.