Alright, so the reading order for the 'Inheritance Cycle' seems straightforward since it’ s a linear four-book series, but there's more to consider than just publication order. You’ve got 'Eragon', 'Eldest', 'Brisingr', and 'Inheritance'. That’s the core, and honestly, that’s the only way to experience the main story. Skipping around would make zero sense. However, a lot of people don’t know about 'The Fork, the Witch, and the Worm'. It’s a collection of three short stories set after 'Inheritance'. I’d strongly advise saving it for after the main quartet. It’s not essential, but it adds some nice world-building and closure. There’s also a short story called 'The Worm of Kulkaras' floating around in an anthology, but it’s very minor. I tried reading 'Fork' after 'Brisingr' once, thinking it was a side thing, and got mildly spoiled for the final book’s outcome. Stick to release order: 1, 2, 3, 4, then the short story collection.
Some fans argue about whether the series is worth finishing if you find the first book a bit derivative, but the reading order itself is never really up for debate.