KanjiJLPT N5
Going

going, journey, carry out, conduct, act, line, row, bank

Mnemonic

A postman hits the street at dawn, Going from mailbox to mailbox without pause. Nothing stops him — not rain, not snarling dogs, not steep hills. That street stretches endlessly ahead, but going forward is the only thing a postman knows how to do.
Additional thoughts
Picture the postman's legs in constant motion on a long, straight street — the kanji 行 even looks like a crossroads or path. The postman's entire purpose is forward movement, embodying 'going.'
Quick recall
A postman marches down the street, forever going forward.

Details

The keyword for 行 is going. This kanji represents the fundamental concept of movement, travel, or proceeding forward. It encompasses the ideas of walking, journeying, carrying out an action, or conducting oneself in a particular way. Beyond physical movement, it also extends to the notion of performing or executing something, as in carrying out a deed or practice.
On'yomi
こう、ぎょう、あん
Kun'yomi
い.く、ゆ.く、-ゆ.き、-ゆき、-い.き、-いき、おこな.う、おこ.なう