Yeah play the first three games. They’re pretty good. Gaiden is pretty fun with speedup on emulators.
FE3 is just as playable as the Jugdral games, no idea why it’s being lumped in with the first two games. Definitely worth checking out as it’s very easy to get into and has a new translation patch.
FE1: https://www.romhacking.net/translations/2800/ (or the Switch version if you can get it)
FE2: Project Dumasday: Fire Emblem Gaiden Translation
FE3: [FE3] Heroes of Light: A new complete and modern translation/localization patch!