Can anyone explain liens and foreclosures to me?

[Ronald P.]

I was listening to a sample call of an interested seller of a house that had a lien of 124,000 dollars. She was talking about foreclosures and how it was going to be put in auction, but she still owned it??? (I don't know how that works.)

What happens when the liens aren't paid?

What types of liens forbid the sale of the property? What types of liens are there?

Does the buyer have to offer more or equal to the lien price if it exceeds market value?

I'm stepping towards my first deal and I want to be sure I know what to say when I'm cold calling. I really appreciate any help!