Here are a few I recommend: "Rich Dad, Poor Dad" by Roberto Kiyosaki; "Set for Life" by Scott Trench; "The Unofficial Guide to Real Estate Investing" by Spencer; "The BiggerPockets Ultimate Beginners Guide" found here on BP; "The Book on Rental Property Investing" by Brandon Tuner.

Ultimately investing is an entrepreneurial activity.

I am currently boosting cash savings with DoorDash.

For tenant screening I suggest you start with Biggerpockets Ultimate Guide to Tenant Screening. 

Ultimately it depends on your market, but given Cleveland is a good area for rentals, it's probably a good idea to keep at least some of them.

Here are a few I recommend: "Rich Dad, Poor Dad" by Roberto Kiyosaki; "Set for Life" by Scott Trench; "The Unofficial Guide to Real Estate Investing" by Spencer; "The BiggerPockets Ultimate Beginners Guide" found here on BP; "The Book on Rental Property Investing" by Brandon Tuner.

Ultimately, my dream is to achieve financial independence and free myself from a 9-5, build generational wealth and allow myself more time with my little ones.

It's a more involved strategy, where you purchase properties that need work, renovate them to boost their value, rent them out, then refinance at their new, higher value.

Thirdly, selling a house with an ADU collecting rent significantly boosts the value for traditional homebuyers.

Start with BiggerPockets Ultimate Beginners Guide (free).