There are good traps and bad traps.
A good trap is a trap you set with a good move
A bad trap is a trap you set with a bad move
If your opponent plays a good move against your bad move, you will have a worse position! So don't play a bad trap, but do learn about them.
Good AND bad traps teach you nice tactics ideas, and remind you to be careful -- especially in the opening! So they are all worth looking at.
Traps
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[Event "?"] [Site "?"] [Date "2020.05.28"] [Round "?"] [White "Good"] [Black "Traps"] [Result "*"] [ECO "D35"] [PlyCount "18"] 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. cxd5 exd5 6. Nxd5 $4 Nxd5 $1 7. Bxd8 Bb4+ 8. Qd2 Bxd2+ 9. Kxd2 Kxd8 * [Event "?"] [Site "?"] [Date "2020.05.28"] [Round "?"] [White "Good"] [Black "Traps"] [Result "*"] [ECO "D35"] [PlyCount "16"] 1. d4 d5 2. c4 e5 3. dxe5 d4 4. e3 $6 (4. Nf3 Nc6 5. Nbd2 Bg4 6. a3 Qe7 (6... Nge7 7. h3 Bxf3 8. Nxf3 Ng6 9. e3 dxe3 10. Bxe3 $16) 7. b4 O-O-O 8. Bb2 $14) 4... Bb4+ 5. Bd2 dxe3 6. Bxb4 $4 exf2+ 7. Ke2 fxg1=N+ $3 8. Rxg1 Bg4+ * [Event "?"] [Site "?"] [Date "1892.01.29"] [Round "?"] [White "Tarrasch"] [Black "Marco"] [Result "*"] [ECO "C66"] [Annotator "DrDave"] [PlyCount "35"] {Just for contrast, here's a Good Trap, discovered by Tarrasch. White plays only good moves, but if Black doesn't choose correctly, White can spring a trap!} 1. e4 e5 2. Nf3 Nc6 3. Bb5 {The Ruy Lopez. In this line, Black goes for the most solid and safe moves they can find, hoping their strong point in the centre will provide shelter...} d6 (3... -- 4. Bxc6 dxc6 5. Nxe5 Qd4) 4. d4 Bd7 5. Nc3 Nf6 6. O-O Be7 7. Re1 { [#] So far, so good.} O-O {Black plays one 'safe' move too many! White can win a pawn here, for if Black tries to hit back and win a pawn back, White wins at least an Exchange. [#] } (7... exd4 $1 $14 {is best here, but because White has been playing good moves on each turn, White can still claim a small advantage.}) 8. Bxc6 { [#] TACTIC: Undermining e5. } Bxc6 9. dxe5 dxe5 10. Qxd8 Raxd8 ({If} 10... Rfxd8 11. Nxe5 {Black can't win back the pawn by} Bxe4 12. Nxe4 Nxe4 {because of the same idea:} 13. Nd3 f5 14. f3 Bc5+ {Here White can just step aside and win a piece} 15. Kf1) 11. Nxe5 { [#] TACTIC: Finally getting around to taking the pawn on e5.} Bxe4 {e4 is outnumbered.} 12. Nxe4 Nxe4 { [#] Has Black been clever?} 13. Nd3 { [#] TACTIC: blocking the d-file and discovering an attack down the e-file -- a pin or a skewer.} (13. Rxe4 { [#] TACTIC: back rank mate} Rd1+ 14. Re1 Rxe1#) 13... f5 14. f3 { [#] TACTIC: attacking a pinned piece.} Bc5+ 15. Nxc5 $1 {With the Black Rooks on d8 and f8, there is a different way to win:} ({Sidestepping here doesn't work so well:} 15. Kf1 Bb6 16. fxe4 fxe4+ 17. Nf4 g5 18. Rxe4 gxf4 19. Ke2 Rde8 $11) 15... Nxc5 16. Bg5 { [#] TACTIC: a fork on e7 is threatened.} Rd5 17. Be7 {'1-0 (17) Tarrasch,S-Marco,G Dresden 1892 EXT 1998 [Tartakower/du Mont/Tarrasch/Reti] '} Re8 { [#] Black has fought hard to hang on, but...} 18. c4 { [#] TACTIC: undermining the defence of c5. Tarrasch's clever line is like a little course in tactics, all by itself. Another notable thing about it: Tarrasch published this line in a magazine, explaining why Black couldn't safely castle on move 7, before winning this game against Marco!} *
Bad Traps
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[[Event "?"] [Site "?"] [Date "2020.05.28"] [Round "?"] [White "Bad"] [Black "Traps"] [Result "*"] [ECO "C50"] [PlyCount "14"] 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nd4 $2 4. Nxe5 (4. Nxd4 exd4 5. O-O c6 6. Re1) (4. c3 Nxf3+ 5. Qxf3 Qf6 6. Qe2) 4... Qg5 5. Nxf7 $4 Qxg2 6. Rf1 Qxe4+ 7. Be2 Nf3# * [Event "?"] [Site "?"] [Date "2020.05.28"] [Round "?"] [White "Bad"] [Black "Traps"] [Result "*"] [ECO "A40"] [PlyCount "16"] 1. d4 e5 2. dxe5 Nc6 3. Nf3 Qe7 4. Bf4 (4. Bg5 Qb4+ 5. Nc3) (4. Nc3 Nxe5 5. e4 $16) 4... Qb4+ 5. Bd2 Qxb2 6. Bc3 $4 (6. Nc3 Bb4 7. Rb1 Qa3 8. Nb5 Bxd2+ 9. Qxd2 Qxa2 10. Rd1 $16) 6... Bb4 7. Qd2 Bxc3 8. Qxc3 $4 Qc1# * [Event "?"] [Site "?"] [Date "2020.05.28"] [Round "?"] [White "Bad"] [Black "Traps"] [Result "*"] [ECO "C50"] [PlyCount "13"] 1. Nf3 d5 2. e4 dxe4 3. Ng5 Nf6 (3... Bf5 $15) 4. d3 exd3 (4... Bg4 $17) (4... Bf5 $17) 5. Bxd3 h6 $4 (5... Nc6 $17) 6. Nxf7 Kxf7 7. Bg6+ *
See also: http://devonjuniorchess.co.uk/content/tarraschs-opening-trap-course-tactics