Most US mortgages are based on 30 years and without assurance on insurance, why would banks continue to make mortgages in higher risk areas if the potential is complete loss?

Real estate investing has been a passion of mine for time with my mother also having invested early on where I likely have gotten the love and desire to follow similar foot steps.I have taken last 6 months to educate myself and currently own a single family home as primary residence and would like to expand to multi family properties (2-4 units) for additional stream of income, not to mention potential tax benefits for long-term investing.Based on current living situation, I have a fair amount of equity established in my primary residency along with having enough cash to either pay off house completely or use towards investing in a multi family property.Given that I'm the sole source of income for our household with my wife being the home maker for our two kids under 2, trying to weigh out risks with getting started now or perhaps waiting. 

I am completely new to the investing side and would love to find something to meet new people/learn as well as learn more about the city. 

From what I understand you could be buying something that is completely dilapidated but even if that was the case if it was for 10k or less, you could sell the land. 

I charge a completive market rate while providing a really good service. 

My advice on sub to is as follows1- COMPLETELY understand the process, implications, liabilities, and possible outcomes before engaging or attempting to engage in a sub to transaction2- Complete disclosure going so far as making sure the other part understands the transaction and possible consequences3- Utilization of an attorney experienced in subject to transactions for setup in such a way that provides some protections in case of default or in case the note is called4- Have a backup plan in case the note is called5 - only use for property that has a TRUE positive cash flow unless the buyer has substantial reserves I myself have purchased 8 properties subject to, but 5 of those were commercial properties which often have notes where a subject to is allowable.  

At least plan B does not sound a complete bad idea now.Thank you!

Quote from @Lamier Guzman: @Jaycee Greene I was thinking Hampton or Virginia Beach, leaning more into Hampton honestly for the duplex's but after my military contract and my 1 year of residing in the duplex is complete I plan on renting both units and moving to Florida or Texas to purchase SFH's and BRRRR them.

This idea that everything goes up in price is completely fictional.

Those particles might not be washing down completely.