This question is looking for a clear summary that leans towards conciseness, and hopefully page numbers in the core rulebook.
I just joined a brand new group for Shadowrun 5e, and I'm fairly certain (from an in-story perspective) I wish to play an Adept, but I don't mechanically get Adepts; there's summary of them near the start of the character creation chapter, but it doesn't dip into mechanics, and the referenced page numbers are discussing references to what they can't do.
The players and GM are all trying to work the system out collectively; we have no expert.
I realize builds are more nebulous than are often found in tabletops (like most editions of D&D and classes), which I believe is why I can't find a section in the book that explains the mechanics of Adepts. Still hunting it seems like I'd find a better section than what I found at the beginning of the character creation chapter.
Mechanically (focused on character creation) what is the foundation of Adepts, and where do I find the actual rules and written considerations about Adepts?