Chekhov, Flannery O'Connor, Carver, Gogol, Kafka... those are kinda entry level (which doesn't mean they're bad) short story writers.
Yeah, you should read one story a day imo. That's the best way you cant start enjoying reading; if you don't finish a story or chapter in a reading session, it may be difficult to engage with it later.

>>7581150
This.

I'd add Cortázar and Rulfo to that list, and state that I strongly support Chekov as a first-read regarding short stories.

After those, you can scale up to more mid-tier to high-tier authors such as Borges or Calvino.

>>7581035
Her Smoke Rose Up Forever by James Tiptree Jr.
Gutshot by Amelia Gray

>>7581035
In the Valley of the Kings by Terrence Holy