I'm learning Fate lore through mutual friends. I might be wrong but heres what I know in short:
"Spears dont get alot of respect"
"How come you can get the grail and I can't get the grail? It's not fair!"
"unlimited blade works"
"Lesyritt is not a nun but a maid"
"Saber is King Arthur not Joan of Arc"
"Zero lancer is not normal lancer but a completely different Irish lance wielding hero"
"Unlimited blade works does not just summon swords to the ground it summons an infinite reality of every sword Archer has ever seen and he constantly fights ridiculously overpowered beings with equally overpowered swords"
"Shirou is not the chosen one the events leading up to his adoption eg. seeing thousands of people die around him at the end of the previous Holy Grail war and than getting avalon placed in him by His adoptive father this causes him to summon saber years later when the holy grail war happens again"
"Bazett is the best She's an Irish Brawler who is one of the only mortals capable of going toe to toe with the past heroes summoned using only her fists"
"Fate servants are referred to by the class their summoned as in order to hide their identity. If they were to just use their names, it would be too easy to figure out which historical or mythological character they are and hence what they can do. For example--Caster is Medea from Greek mythology; Rider is Medusa, also from Greek mythology; Saber is King Arthur from Arthurian legends; and Berserker is Heracles."
Heres fun stuff for fans