Thank you for sharing this i find it useful
Chess Tactics: Definitions and Examples

Just noticed this recent article,
https://www.chess.com/article/view/do-you-need-to-know-chess-mates-and-tactics-names
My personal favorite is Chess Network on YouTube .

Thanks Piperose, I give out the link 'Do you need to know...' article in response to posts but forgot to include it here, I've added it now.
Which of the Chess Network do you recommend?, is it How to Solve Puzzles & Puzzle Quizzes?: http://www.youtube.com/playlist?list=PL542BA724CC5A1A3B
and/ or Cool Chess Puzzles?: http://www.youtube.com/playlist?list=PLQsLDm9Rq9bHvcSe573ZzdNjLkwyPoMP2
Or something else?, thanks in advance.
I found these articles useful, I'm sure you will too, a big thankyou to the authors
https://www.chess.com/article/view/chess-tactics--definitions-and-examples
https://www.chess.com/article/view/do-you-need-to-know-chess-mates-and-tactics-names
https://www.chess.com/article/view/spotting-and-avoiding-tactics
https://chesstempo.com/tactical-motifs.html
https://chesstempo.com/positional-motifs.html
If you know any other good one's then please share