en_tn/num/04/31.md

This is their responsibility

"This" refers to what Yahweh says next.

their sockets, pegs, and their ropes, with all their hardware

Here "their" refers to the posts of the court.

crossbars, posts, and sockets ... and their ropes

These are all parts of the framing of the tabernacle. See how you translated all of these parts in Numbers 4:31-32.

List by name the articles they must carry

"List by each man's name the articles he must carry"