This Is The Correct Order In Which To Watch Fate

There are three routes in the original "Fate/stay night" storyline, which follow protagonist Shirou as he interacts with three different heroines during the Fifth Holy Grail War, and each of these has been adapted differently. The first story released was "Fate/stay night," an anime by Studio Deen that follows Shirou's interactions with Saber, the female King Arthur. Then there's "Unlimited Blade Works," the story of Shirou's teamup with Rin Tohsaka, which is a two-season anime. Finally, the "Heaven's Feel" trilogy of films explores the final route, where he fights to protect his friend Sakura.

In our watch order, we'll start with "Unlimited Blade Works" and "Heaven's Feel" before finishing up the trilogy with the original series and then move on to the major offshoots. This will give you the most even and understandable perspective on the worlds and universes of "Fate." 

In "Unlimited Blade Works," Shirou and Saber team up with Rin Tohsaka to survive the Holy Grail War. It's a great ten-hour introduction to the themes and rules of the story and prepares you for the darker "Heaven's Feel" films without getting bogged down in their own continuity. Over the course of the series, "Unlimited Blade Works" examines the Reality Marble of Shirou Emiya and acts as his Noble Phantasm, a kind of powerup for Servants. The stronger Shirou becomes in his magic, the closer he gets to this true heroic state.

Note that the "Unlimited Blade Works" movie, also known as "Sunny Day," is an original video animation (OVA) released by Studio Deen after their "Fate/stay night" series and isn't really necessary to enjoy or understand the franchise. Here, we're talking about just the Ufotable anime "Unlimited Blade Works."