There are three levels (beginner, intermediate and advanced), with each anchored by a set of instructional videos featuring Christian Gutierrez and, sometimes, his partner Lien Pham.
In other words, Mr. Shupack said, by recording the mortgage, a lender legally establishes the priority of his or her lien.
In the last few years, he's had to answer for his tax liens, a foreclosure and an accusation that he owed more than $117,000 in past-due child support.
At one point, the occupants of the Range Rover — Mr. Lien, his wife and their 2-year old daughter — found themselves amid a large number of motorcycles.
As he filled in the colors of his map, Mr. Lien gave directions to Mr. Hai, speaking quickly and sometimes unintelligibly.
He has a lien on his house for not paying his taxes.
Video footage shows riders swarming around his car before Mr Lien drives off, running over biker Edwin Mieses Jr. Mr Mieses broke his legs in the collision and suffered spinal injuries that will leave him paralysed, his family has said.
He could put a lien on his house, ask friends for money or sell his cars.
Among Mr. Santiago's problems were a federal tax lien on his property, filed in 1993, for the $33,000 owed on his 1987 and 1988 tax returns.
Mr. Lien and his wife did not respond to messages seeking comment.
