Let’s discuss the hidden costs and potential pitfalls of traditional financing methods that many investors overlook.

My local RE group is looking at having a webinar with people involved in those businesses to share their experience and that it's not as easy the social media gurus say it is If you haven't already joined a local meet up group, I'd recommend that to help you narrow down your strategy and market. 

Hey @Austin Wolff - You bring up some good points about knowing the house better than anyone when you build new if you are actively involved and onsite regularly, but I'd get behind @Jay Hinrichs, in the sense that the numbers don't always allow you to build new.Here in Chicago, new developments are super pricey, and even the BEST DEVELOPERS HAVE SLIM MARGINS. 

Unless you have developed software or paid someone to do it people often do not understand the cost involved.

Secondly I just finished "Real Estate by the Numbers" also by Dave Meyer - even though I have a business degree and am actively involved in investing it was a really great refresher on not just the numbers and theories involved in real estate decisions but also the pros and cons of different return metrics and how all the metrics relate to one another. 

It's best to involve a real estate attorney to ensure the contract is legally sound.

I need some helps and advices on my next move.I'm thinking to sell my rental property to get $150,000 cash in hand, then look for a Duplex/Triplex in Garland, Grand Prairie, Irving, or Arlington to do a House Hacking method to put only 5% down.

@Hoai Nguyen suggest modifying your current lease to cover multi-family setup.Parking, shared access, police report required for landlord to get involved in disputes, etc.

My local STRs require me to be VERY involved. 

It is very important to also know what is best contact method, usually sellers agent communicate this to your agent.