Good sources of further education for note investor?

[Rob Cee]

I have been doing hard money lending for a few years though hard money brokers which source and set up the loans for me to fund. I have not gone out and purchased any existing notes yet, I have just funded new loans. What are the best education materials to further my knowledge? Materials with a lot of DETAIL on all the due diligence that has to be done, everything that can go wrong, examples of what has gone wrong, details on making sure all the paperwork is bullet proof, etc... I'm more interested in materials that focus on the note investing side of it, not as much note brokering. Since I'm doing most of my HML in CA, I read the George Coats book "Smart Trust Deed Investing in California" which had some good detail but is an older book (1991). I want to keep furthering my education so I can mitigate my risks as much as possible on these investments I'm making. Thanks for your suggestions!