Dominant 7ths

My teacher covered this with me yesterday and has asked me to practise those starting on G and on F. However when I got home I found I couldn’t remember it all properly. A search on You Tube brought up a very helpful video and this poster has lots of free video content at both easier and harder levels than this (as well as reasonably priced worksheets from his website.)
Anyway I thought other beginners might find this helpful.