Many things happen over the course of your adventures in The Witcher 3. Some are forgettable. Most are far from it.
Here, then, is an objective and comprehensive list of...ah, who am I kidding, here's a massive list of the things I loved most from a game I love so damn much.
USE YOUR WITCHER SENSE TO AVOID MASSIVE SPOILERS
(Note: I say Everything* in the headline because while I have opinions on almost everything in the game, from Dwarven Ale to NPC lines like "another drifter in from Temeria", I don't want to keep you here all day. This, then, is just the best stuff.)