King's Indian Defense
AdvancedBlack's fighting answer to 1.d4. You let White build a pawn centre, put your bishop on g7, and counterattack — taking the slightly worse but sharper side. It's the cousin of the Sicilian Dragon: the same g7-bishop attack, but against 1.d4, and slower — you strike with a kingside pawn storm once the centre locks.
Once the centre locks (after your ...e5 and White's d5), throw your pawns at White's king — push ...f5, then ...f4, then ...g5 and ...g4 to pry open lines.
White is attacking on the other wing, so it's a race: don't be slow.
Key Strategic Ideas
The King's Indian is a counterattacking setup: instead of matching White's centre pawn for pawn, you invite it, then hit back with a pawn break and pieces. After White locks with d5 there are two roads — restrain the queenside, or storm the kingside.