You should moisturize your face after cleansing and toning, and before applying any other skincare products. This will help to lock in the moisture and create a smooth base for the rest of your skincare products.
It's also a good idea to moisturize your face twice a day, once in the morning and once at night. This will help to keep your skin hydrated and nourished throughout the day and night.
In general, it's best to apply moisturizer to your face while your skin is still slightly damp, as this can help to seal in the moisture. If your skin is extremely dry, you may want to apply a moisturizer immediately after cleansing, while your skin is still wet. This will help to lock in the maximum amount of moisture.