Ordinary store: It can be refreshed once a day and purchased on demand.
Stock Store: If you like Mengzui, buy Mengzui, Memories Fragments, Essence of Inspiration, Ether Coins (when there is no shortage of coins in the later period), King Upgrading Stones
Arena Shop: Magpie Bridge Immortal, four-star memory fragments, first attack upgrade stone
Xinhai Store: Pink lips, four-star memory fragments, inspiration and experience (preliminary pictures)
Breakdown Store: Buy What You Need
After reading this article on recommendations for exchange options in stores in the Singularity Era, have your doubts been lifted? If everything has been resolved, it will be worthwhile to consult a lot of information. If you still don't understand some parts, you can also ask questions in the comment area.