Detect a Trap
Senses. Look, hear, feel, or smell for evidence of a trap. See examples. Usually a Wisdom (Perception) check against the trap's DC will be required. (82)
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Moving at a fast pace can give you disadvantage.
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Proficiency with certain tools can sometimes help.
Logic. Sometimes your senses are not enough – an Intelligence (Investigation) check instead of, or in addition to, a perception check is necessary. (81) See examples.
Lore. A lore-based Intelligence check might help in certain situations. (81) See examples.
Magic Traps. Use an Intelligence (Arcana) check to detect a magic trap. A perception check will work on some magical device traps. See examples. An an investigation check will work on most spell traps. See examples.
Using magic. Spells or magic items may help you discover a hidden trap.