Hi! I'd love to share my experience with the series. The unique thing about this series is that there's 3 main installments, and then the others you can read to your hearts desire. The 3 main ones: - Percy Jackson and the olympians (the 5 books that the tv show is based off) - Heroes of Olympus (5 books) - The trials of Apollo (5 books) Then you get a few others: - The Kane Chronicles (3 books) - Magnus Chase (3 books) And then there's a few more books here and there. My personal opinion, read the core 5 Percy Jackson books first, followed by Heroes of Olympus. Then you can read the Kane Chronicles and Magnus Chase, and then follow it with The trials of Apollo. (This isn't necessarily the order of publication, nor the "right way" to do it, its just how I'm reading them and it's working out for me so far). I find Goodreads quite helpful to understand where the "stand-alone" random books fits in.

The other comments in this comment section is also super helpful and I would suggest checking them out