She has always had a real knack for this stuff. She has training in something and she can make a living at it.

I have the knack of easing scruples.

He did well. I could see that he had the knack.

He has this big generator he's started once a year for like 20 years just for stuff like this,

I was giddy when I found out how well she had done. They are really amazing to see.

The Internet has made it so much simpler for people who want a house-sitter or people who are looking to live rent-free.