There are 3-4 Windwheel Asters each location, and you can get around 30 in total.
You can get about 14 Windwheel Asters.
ATK% VS Physical/Elemental DMG% in Genshin
Puzzles, Secrets, and Hidden Chests in Dragonspine
Puzzles, Secrets, and Hidden Chests in Liyue
Tartaglia "Childe" Boss Fight Guide