悟 is built from the 忄 (heart (left)), 五, and 口 components.
It reads ゴ like 五, as do 語 — learn 五 once and the family's reading comes with it.
A common word using 悟 is 覚悟 (かくご), meaning “resolution, resignation, readiness”.
Kanji that look similar include 悦, 悩, 恒, and 恨.
