>>713463870
Depends on how you want to be introduced.
Handhelds are very digestible:
Fates (Conquest for gameplay), Sacred Stones, Awakening, Blazing Blade/Binding Blade (These are connected)
Personal Faves are Radiant Dawn/Path of Radiance.
Three Houses if you want a recent game to start on.
Starting from the original releases to latest can be a slog, would only recommend originals if you get into the series.