Komoku and joseki
The 3-4 point — komoku — sits on the third line one way and the fourth the other, and the asymmetry is its personality: it leans further into corner territory than the symmetrical 4-4, so a single stone here already threatens to seal the corner outright, at the cost of a little flexibility. It was the signature corner of twentieth-century Go, the ground from which the classic joseki grew. Joseki themselves — the studied local exchanges — are worth sampling, not memorising wholesale: learn one or two patterns per popular corner, and above all learn what each side gets, because a joseki is a fair trade whose value depends entirely on what the rest of your board wants. Take a komoku yourself.
Start it yourself: take a corner with komoku, the 3-4 point.
Play one of the marked points to finish this lesson.