what’s the aim of the puzzles?

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Butscrub
They don’t tell you what you are supposed to be solving. It’s not checkmate. I followed the hints to the point is says “puzzle solved” and I’m still none the wiser as to what on earth has been “solved”. Anyone know?
Strangemover

You just have to find the best move/sequence of moves. Sometimes that's checkmate, or it can be other things like getting a promoted pawn, winning an exchange etc. Usually at the end of it the solution has given your side a winning position or an advantage. If you're not sure why the solution is good click the little magnifying glass and see the analysis. 

Zjlm1015
The puzzles are challenging your use of tactics, which tactics are instinctual, and which tactics you must think about. Forks, and revealed checks, etc., are common and instinctual tactics that most people know. The more you progress in the puzzles, the more complex the positions become, and a small advantage at very high level tactics, is a very high reward that would eventually lead to checkmate.
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PunchboxNET
Dont spam
FutureGMSarvesh

Could you show me some puzzles like that, please?

MarkGrubb

Puzzles are easier to understand when you have done some of the lessons. Recommend doing the lessons on basic tactics, forced moves, and powerful moves. When you've done these, including the exercises, you'll be ready for puzzles and more likely to 'get' them. If you like books then I recommend Chess Tactics for Students by Bain.

Zjlm1015
Mark, why don’t you play blitz?
MarkGrubb

Hi. Because I'm rubbish at it. I make terrible moves, blunder everything and dont enjoy it. I prefer a more thoughtful game where I have time to think and find better moves and coherent plans.

Lagomorph
Butscrub wrote:
They don’t tell you what you are supposed to be solving. It’s not checkmate. I followed the hints to the point is says “puzzle solved” and I’m still none the wiser as to what on earth has been “solved”. Anyone know?

The point of the puzzles is to make you think like a chess player.

Feel free to post the ones  you do not understand and you will get help.