
Harry Potter and the Philosopher's Stone (US: Sorcerer's Stone)
Core book
1997
Best place to start. The UK title is Harry Potter and the Philosopher's Stone; the US edition is Sorcerer's Stone.
The seven core Harry Potter novels in publication and story order, followed by the optional Cursed Child stage-play script.
Begin with Harry Potter and the Philosopher's Stone, called Sorcerer's Stone in the United States, and read the seven novels in publication order. Cursed Child follows Deathly Hallows but is an optional stage-play script rather than part of the core novel sequence.

Core book
1997
Best place to start. The UK title is Harry Potter and the Philosopher's Stone; the US edition is Sorcerer's Stone.

Core book
1998
Second core novel. Continue directly after Philosopher's Stone.

The core story consists of seven novels. Harry Potter and the Cursed Child is an official later story presented as a stage-play script, so this guide lists it after Deathly Hallows as optional continuation material.
No. They are different UK and US titles for the same first novel. Start with whichever edition is available to you.
No. The seven novels form a complete first-read route. The Hogwarts Library books and Fantastic Beasts screenplays are optional branches for readers who want more of the Wizarding World.
Core book
1999
Third core novel. Publication order preserves the intended character introductions and reveals.