Man, if you want a simple, no-fluff run-down of how Devil Fruits work in 'One Piece', there are a few places I always send people—plus a tiny cheat-sheet I scribble in my head.
First, the short rules: there are three basic fruit types (Paramecia, Zoan, Logia). Eat one, you get powers but you lose the ability to swim. Haki and Sea-Prism Stone can counter powers. Awakening is an upgrade some fruits get. Normally one fruit per person, though the story has rare exceptions and weird mechanics that get explained as you read. For clear, bite-sized summaries, the 'Devil Fruit' page on the One Piece Wiki is my go-to for quick facts and fruit lists. If you prefer videos, Tekking101 and Grand Line Review do concise explainers with visuals that make distinctions (Logia vs Paramecia) click.
If you want something a bit deeper without getting lost, look for the SBS (Oda’s Q&A) snippets and the official databooks—those clarify terms like 'awakened' and list canonical examples. Reddit's r/OnePiece has simpler threads and pinned beginner guides if you like short discussions. I always tell people to combine a 5–10 minute wiki skim with one explainer video and a few manga panels for context — it makes the rules actually stick.