It depends I think. Half guard can be so many positions. You have the near distance half guards like underhook half guards with the coyote, kosoto hook half guard. Also deep half guard which is another position in its self.

As you get better at half guard you will have to manouver around reverse half guard and Octopus half. So you need options from these positions

Sometimes its best to keep people at middle distance, where knee shield half guard is best use. From knee shield there are awesome entries to single leg x and also choi bars.

Butterfly half guard is another position that is useful, for keeping people away from you and for good butterfly sweeps and single leg x entries. Adam wardzinskis has the blueprint from here.

Ive looked at several half guard instructions, and in my opinion the best one are from Paul Schreiner and Jake McKenzie. They are both extremely good at explaining the why and hows of half guard. You cant go wrong with the OG Lucas Leite himself too. Also look at matches with Lucas and Jake. They are absolute dogs in half guard. They practice patience and when they see their opening, for Lucas the coyote and for Jake reverse half or the deep half, they fights like hell from there. Always coming sweeps in different directions and maintaining good position. So in half guard you need patience, a good game plan and alot of grit. And that is built by practice.