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That “write your own mortgage” thing; how to learn about it
You are asking about a common, simple practice of holding the mortgage when selling a house you own outright. Typically called seller financing.  Say I am 70 and wish to downsize. The money I sell my house for will likely be in the bank at today's awful rates. Now, a buyer likes my house, and has 20% down, but due to some medical bills for his deceased wife, he and his new wife are struggling to get financing. I offer to let them pay me as if I were the bank. We agree on the rate, I have a lien on the house just as a bank would, and my mortgage with them requires the usual fire, theft, vandalism insurance. When I die, my heirs will get the income, or the buyer can pay in full after I'm gone.  In response to comment "how do you do that? What's the paperwork?" Fellow member @littleadv has often posted "You need to hire a professional." Not because the top members here can't offer great, accurate advice. But because a small mistake on the part of the DIY attempt can be far more costly than the relative cost of a pro. In real estate (where I am an agent) you can skip the agent to hook up buyer/seller, but always use the pro for legal work, in this case a real estate attorney. I'd personally avoid the general family lawyer, going with the specialist here.