What thickness is
Thickness is a group with nothing left to fear — connected, eye shape available, liberties deep. Its power is not the ground it sits on but the pressure it radiates: nearby enemy stones are weak by comparison, nearby territory is nearly yours, and every future fight in the region starts with a bonus. Hence the golden rule: never touch the wall. Playing close to thickness lets the opponent use it twice — your stone gets attacked and the wall gets reinforced — while using thickness from a distance lets it do the attacking itself. A wall like this one faces the whole open right side; find a point that borrows its power without standing in its shadow.
Play near the thick wall — but not too close. See the AI's verdict.
Play one of the marked points to finish this lesson.