Regarding a "loan partner" vs "equity partner"

[Patrick K.]

Hi all, have been binging on BP podcast these days, I keep hearing Mr. Greene mentioning whenever he gets into a project with a partner, he prefers a "loan partner" rather than an equity partner. 

I am wondering how does one set up this partnership?

Is there any difference between a "loan partner" and a private lender

Is the "loan" registered against the property?

if so, will it interfere with getting a mortgage? assuming a lender doesn't like/allow a second mortgage?

Thank you for your time.