We have a good number of clients at our accounting firm that owner residential and commercial real estate.
Real estate investing can be profitable.
A good real estate investment has to do with knowing what a potential property's fair market rental value is vs the sales price or another way to say it is the monthly cost to rent vs the monthly cost to own. Generally those numbers are pretty close to each other so the only way to make a good real estate investment is to get a good deal on the purchase.
To put it another way, "Buy low sell high".
With that said there is a ton to learn and a blog post is not going to give you what you need. If you are just starting to look, get on the meetup webpage and look for real estate investment groups in your area and go attend some meeting and just learn everything you can.