Also William Hope Hodgson , Francis Steven's, Abraham Merritt, Algernon Blackwood, Robert E Howard , Clark Aston Smith , Lenard Cline. Robert W. Chambers, August Derleth, Manley Wade Wellman, Robert Bloch , Seabury Quinn , Henry Kuttner, C. L Moore , Frank Belknap Long , Ramey Campbell And if you can find it. Irving Cobb'd short story Fishhead.Often with Lovecraft I find the famous ones are less user friendly for beginners. Certainly The Call of Cthulhu is somewhat intractable.
I think The Whisperer in Darkness is a great start, and echo sentiments about Rats and Tomb. I think The Music of Erich Zann might be my favourite Lovecraft story. Pickman’s model, The Haunter of the Dark and The Thing on the Doorstep are worth a look.
Then when you’re done with Lovecraft you can throw yourself into M R James and Arthur Machen.