祉 is built from the 礻 (altar / spirit (left)) and 止 components.
It reads シ like 止, as do 歯, 紫, and 雌 — learn 止 once and the family's reading comes with it.
A common word using 祉 is 福祉 (ふくし), meaning “welfare, well-being”.
Kanji that look similar include 祈, 初, 社, and 祖.
