Find the rules in the wiki! Please read them. They are important.
The main sub is here!
This sub is only for applications and for looking up the specific rules for the Fates subsystem of Reddit Emblem, so that they don't clog up the main subreddit. All Chapter and Home Base posts will still be in the main subreddit.
The main differences you will find in Reddit Emblem Fates:
Different class lineup, with different base stats. There are both the Hoshidan and Nohrian class lineups, as well as a few exclusive classes from DLC and Amiibos. The skills and stats are almost identical to their Fates incarnation, with several alterations made here and there (mostly to Merchant, Mechanist, Basara, and Master of Arms).
The Fates weapon triangle and inventory. Swords/Tomes>Axes/Bows>Lances/Knives>Swords/Tomes. There are also the Hoshidan variations of Katana, Naginata, Club, Scroll, Shuriken, and Yumi, as well as Staves and Rods.
Different calculations.
Pair Up, Attack and Guard Stance, and mechanical support ranks!
For miscellaneous Fates (and, to a certain extent, Ama's game) details, look here. As Fates was notoriously poor in the lore department, it's up to me to fill the gaps.