What exactly does this mean and how can I practice these things?

Networking is always a great practice and you never know who you might meet there and what good information they have to share.

I wonder if the interest rate on the HELOC will be too high to make the monthly rental rate practical for a renter.

While this is a violation of the covenants of the deed of trust or mortgage instrument, and theoretically (if the note holder becomes aware) the note holder can accelerate (demand full payment) of the note, in practice this rarely happens.However, there are risks for both the buyer and seller in a subject to transaction.  

HUGE missed opportunity if you are running multiple campaigns (email, text, etc.) simultaneously.

You just need to practice.

You sound happy, and I’m happy for you.Not to poke holes at you, but househacking a duplex you got commission on for being the broker while simultaneously needing an FHA loan to contain costs/minimize expenses isn’t something I would count as a 1% property on the MLS as it’s not repeatable, and further proves the point deals are no longer “had” or “found”- they require active participation to be “made”.

Individuals who have received a CPA designation are trained in generally accepted accounting principles and best practices (including online tools).

Is this common practice?

Just be mindful that he has his practice set up remotely.Best of luck to you in your search.