Once I got into the low kyus, I bought some japanese tesuji, yoseki and endgame books. Some of the techniques particularly in the tesuji book were quite useful. Also, my mom got me a book Invincible that's just a collection of Honinbo Shusaku's games and commentary on them which is fucking cool to replay some of his games, even if a lot of it is lost since I'm not at that level..
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