h-l-kh — to go, to walk
ה.ל.ך (halakh) means to walk, and halakhah — Jewish law — is literally "the way one walks". One of the most irregular verbs in the language.
The word family
Every word below is built on ה.ל.ך. Same three letters, different vowels and prefixes.
The ה vanishes completely in the future. This is the irregularity worth memorising early.
The way one walks — law as a path rather than a code.
In the text
וַיִּתְהַלֵּךְ חֲנוֹךְ אֶת־הָאֱלֹהִים
Va-yithalekh Chanokh et ha-Elohim
And Enoch walked with God.
What I tell students about this root
Learners get frustrated that halakh loses its first letter in the future tense, and it does look arbitrary. The consolation is that this is one of a very small number of genuinely irregular Hebrew verbs, and it is so common that you will have it memorised long before you understand why.