Like other Smash Bros. games, you'll be able to unlock different things like Music, Mii Outfits - and of course - Fighters. This page will guide you on
Power Plant - Super Smash Bros. Ultimate Guide - IGN
Characters - Super Smash Bros. Guide - IGN
Super Smash Bros. Ultimate: How to Unlock Every Character (Fastest Method) - IGN
Sacred Land - Super Smash Bros. Ultimate Guide - IGN
Badlands - Super Smash Bros. Ultimate Guide - IGN
Super Smash Bros. Ultimate Guide - IGN
Spirit Board Events - Super Smash Bros. Ultimate Guide - IGN
Spirits - Super Smash Bros. Ultimate Guide - IGN
Super Smash Bros Ultimate characters: every playable Fighter
Characters and Roster - Super Smash Bros. Ultimate Guide - IGN, smash
How to cheat character unlocks in Smash Bros Ultimate
WarioWare Inc. - Super Smash Bros. Ultimate Guide - IGN