Using Question Tags!

vor einem Jahr
I have been thinking about how to ask questions in English recently, and I am interested to know if anybody out there learning English is currently using Question Tags?

Do you know what a Question Tag is? If so, do you know how to use them? How do you form a question using tags?

This is a very colloquial way of asking a question in English and is a high level skill (in my opinion). So, let me know what you think!