Many people argue why has Fate series become so popular – is it the existence of historical figures being summoned as anime-style-characters to kill each other in a battle royale or is it the waifus who wield superpowers what catches one’s attention?
No matter what we say there is no denial that Fate series is not only popular but also high ranked – MAL users rank Fate series on average about 8/10.
I personally recommend you to watch Fate/ Zero first because it’s a prequel (set 10 years before Fate/Stay Night: Unlimited Blade Works). There is also a movie with the same name and Fate/Stay Night series from 2006 but I don’t recommend watching them because they don’t match up in production values as the Ufotable versions.
Warning: You can alternatively swap Fate/Stay Night: Unlimited Blade Works for Fate/Stay Night (2006) or you can watch Fate/Stay Night: UBW/ Fate/ Stay Night first instead of Fate/ Zero.
1. Watch Fate/ Zero Season 1 and 2 (2011-2012)
Watch all 25 episodes as they are all manga canon or manga canon mixed with filler episodes.
2. Watch Fate/ Stay Night: Unlimited Blade Works Season 1 and 2 (2014-2015)
Watch all 25 episodes since they are all considered manga canon.
3. Watch Fate/Stay night Movie: Heaven’s Feel
2 of them are already released and one is going to air in 2020.
4. Watch Fate/kaleid liner Prisma ☆ Illya (2013), Fate/kaleid liner Prisma☆Illya 2wei! (2014), Fate/kaleid liner Prisma☆Illya 2wei Herz! (2015) and Fate/kaleid liner Prisma☆Illya 3rei!! (2016)
These are spinoff anime series which include characters and universe with Fate/ Zero and Fate/ Stay Night so it’s obviously mandatory to watch those first. There are 43 episodes in total and I recommend to watch all episodes except episodes 3, 4 and 5 of Fate/kaleid liner Prisma ☆ Illya 2wei Herz! (2015) because those contain fillers.
5. As for Fate/Apocrypha, Fate/Grand Order, and Fate/Extra, these are all stand-alone installments so you can watch them anytime you want (or don’t)
You can watch them also independently but will make more sense in general after having seen some of the main stories (Fate/ Zero and Fate/Stay Night: UBW). They are in my opinion not particularly important though.