So you use hard money or cash, fix it, resell it...and try to resale fast. 

Hey Brandon,I had good success by getting equity lines on properties to access the cash to invest again. 20% is certainly not essential if you want to go lower there are many lending options for lower down payments, especially if you are willing to house hack!

Good cash flow and equity upon completion.

Purchase price: $450,000 Cash invested: $650,000 Sale price: $1,600,000 New construction of single family

Alternatively, platforms like Twilio provide excellent customization but might require more technical setup for Podio.

I have been using Rentredi, but allowing them to pay through cash app/venmo. 

Purchase price: $375,000 Cash invested: $60,000 Sale price: $525,000 This home was build in the 1980's.

Purchase price: $142,500 Cash invested: $25,000 We purchased 2 adjacent, tiny rowhomes in the Northern Liberties neighborhood of Philadelphia.

Otherwise they would have sold, taken the tax free cash and moved on. 

Purchase price: $160,000 Cash invested: $45,000 Ended up buying the property after getting to know the owners who were cleaning up when I went over to ask them permission to cut down the leaning branches toward their roof.