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That “write your own mortgage” thing; how to learn about it
The other answers are talking about seller financing.  There is another type of arrangement that might be described as "writing your own mortgage," where the buyer arranges his (or her) own financing.  Instead of using a bank, a buyer might find his own investor to hold the mortgage for him. An example would be if I were to buy a house that needs fixing up.  I might be able to buy a house for $40,000, but after I fix it up, I believe it will sell for $100,000.  Instead of going through a traditional mortgage bank, I find an investor with cash that agrees the house is a good deal, and we arrange for the investor to provide funds for the purchase of the house on a short-term basis (perhaps interest-only), during which I fix up the house and sell it.  Just like a regular mortgage, the loan is backed by the house itself. I am not recommending this type of arrangement by any means, but this article does a good job of describing how this would work.  It is written by a real-estate guru with lots of training courses and coaching materials that she would like to sell you.  :)