By difficulty
One-move puzzles
Puzzles whose whole answer is a single move. No calculation, no sequence: either you see the pattern or you do not. They are the best possible warm-up before a game, and the best possible measure of which patterns you actually recognise rather than work out.
How to spot it
Take them at speed and notice which ones you miss. A one-move puzzle you had to think about is a pattern that is not yet automatic, and those are exactly the shapes worth drilling until they are.
The positions
Easiest first. Every one is from a real game, and the rating under each board is what it costs the players who have tried it on lichess.
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1. Black to play Play it out →Answer
42...Qxd3
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2. Black to play Play it out →Answer
9...Nc2+
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3. Black to play Play it out →Answer
50...d1=Q+
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4. Black to play Play it out →Answer
39...Bh4+
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5. White to play Play it out →Answer
43.Ne5+
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6. White to play Play it out →Answer
21.Rxd1
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7. White to play Play it out →Answer
19.Nh4
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8. Black to play Play it out →Answer
14...Rxd5
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9. White to play Play it out →Answer
14.Qxf5+
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10. Black to play Play it out →Answer
17...Qg4
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11. Black to play Play it out →Answer
38...Rexd6
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12. Black to play Play it out →Answer
40...d2
Reading about a pattern is the easy half. Motify finds the positions where you missed one, by running your own lichess and Chess.com games through Stockfish, and puts each of them behind two or three puzzles on the same idea so you meet it having just found it three times. See how Motify works.
Positions from the lichess puzzle database, released under CC0.