Understanding calorie surplus

I am trying to gain muscle and someone told me I need to eat in a calorie surplus. Does that mean I should keep eating even when I am already full or is there a better way to increase calories

Bro you dont need to force yourself to overeat

Start by adding a small amount of food to your regular meals

Milk and bananas are easy additions

A small calorie surplus is enough to start

I added one extra snack to my daily routine

Track your weight to see whether it is working

Choose foods that are easy for you to digest

Slow weight gain is better than eating randomly