The all-purpose word for "awesome"

Genial

heh-NYAL — Great / awesome

"¡Nos vemos mañana! — ¡Genial!"
See you tomorrow! — Great!

Works for reacting to good news, describing a person, or a plan — one word covers a lot of the same ground "awesome" does in English.

"One of the first Spanish words my little niece learned to say back to me — now she uses it about everything."— Graciela