How often should I exfoliate at night?

2-3 times a week, depending on your skin type. Over-exfoliating can cause irritation.

Can I skip moisturizer if I have oily skin?

No! Even oily skin needs hydration. Choose a lightweight, gel-based moisturizer.

Niacinamide and salicylic acid serums help control oil and prevent breakouts.

No, but always apply sunscreen in the morning to protect your skin from UV damage.