Spoon the mayonnaise and the sour cream into a bowl.
Finely cut the garlic, dill, parsley, chives. In case we use dried ingredients, obviously they don't have to be cut but double the amount of parsley we use.
Add the finely cut herbs to the sour cream and mayo.
Mix everything together then taste and flavor it as necessary. Mind that fresh herbs need a couple of hours in the fridge to let their full flavor out so don't be hasty pumping it up with garlic. Add buttermilk or milk to the ranch dressing gradually and stop when we reach the desired consistency.
Fill it into an airtight container and keep it in the fridge until it's served.