You can learn a lot of kanji on WaniKani. But still, there are lots more out there.
I learned 籤 (くじ lottery, raffle) while looking up the word あみだくじ, those lotteries where you draw lines in a ladder-like pattern (which, btw, is 阿弥陀籤 in kanji, since it comes from the Buddhist term, which I was also unaware of)
Other common words that use it are 宝籤 (たからくじ, lottery) and 籤引き (くじびき, drawing lots)
How about you?