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Minute  Hour Day  Mon  Weekday

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*    *    *    *    *  command to be executed

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*    *    *    *    *
┬    ┬    ┬    ┬    ┬
│    │    │    │    └─  Weekday  (0=Sun .. 6=Sat)
│    │    │    └──────  Month    (1..12)
│    │    └───────────  Day      (1..31)
│    └────────────────  Hour     (0..23)
└─────────────────────  Minute   (0..59)

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# Adding tasks easily
echo "@reboot echo hi" | crontab

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# Open in editor
crontab -e

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# List tasks
crontab -l [-u user]