What muscles does the Good Mornings work?

Mainly the glutes and hamstrings. It also works the abs.

What equipment do you need for the Good Mornings?

None. It is a bodyweight exercise.

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A standing hip-hinge bow that trains the hamstrings, glutes, and lower back — a clean teaching piece for the hinge pattern.

Stand tall with your feet hip-width apart, hands crossed at your chest or behind your head.
Brace your core and unlock your knees with a soft bend, keeping that bend constant through the rep.
Push your hips backward and bow your torso forward, keeping your back flat from head to tailbone.
Lower until you feel a deep stretch in the hamstrings or your torso is roughly parallel to the floor.
Drive your hips forward to lift your torso back up to standing, squeezing your glutes at the top.
Pause briefly upright before starting the next rep, keeping the same knee angle throughout the set.

Rounding the back as you bow forward, which loads the spine instead of the hamstrings and glutes.
Bending the knees more as you go down, turning the hinge into a half-squat and reducing hamstring work.
Going past parallel before the hips can absorb the stretch, which strains the lower back.
Standing up by pulling with the lower back instead of driving with the hips and glutes.

What muscles does the Good Mornings work?: Mainly the glutes and hamstrings. It also works the abs.
What equipment do you need for the Good Mornings?: None. It is a bodyweight exercise.
Is the Good Mornings good for beginners?: GymVim rates it beginner.