Objective: Defeat the Giant Goomba. This is your first mini-boss encounter. The Giant Goomba has high health and can deal significant damage. It also has a stomp attack that can push your characters out of cover. Focus all your fire on the Giant Goomba. Use Mario's Hero Sight to get extra attacks when it moves. Rabbid Peach's Heal is crucial here. Try to keep your characters spread out to avoid its area-of-effect attacks. Utilize any explosive blocks in the environment to deal extra damage. After defeating it, you'll gain access to the first World 1 Boss Battle.
