I was wrong. 

That isn't written somewhere specifically that way, but your lender will ask why you would move your primary from (for example) a 2,000 SF SFR to a 750 SF unit in a four plex? 

If you think something is wrong with the way it s done, teach people how to do it right.

If I have several options, I would prefer a HELOC with no initial draw requirements (i.e. to establish a literal line of credit that I have no specific short term plans to use), i.e. not something like the better.com HELOC. 

There are a lot of site-specific issues you need to investigate before deciding what the land is worth to you.

Its crunch space in case things go wrong.

There are a few specific area we target in Sacramento depending on your goals.

Feel free to reach out if you have any specific questions about the area.

You can find online which larger institutions are buying in a specific area and try and reach out to them.

Would you share 3 specific things I should do during my "training period" (if it includes a book, which one)?