honey super

I have only been a beekeeper for 10 months, so please for forgive my ignorance! I was wondering why you are supposed to leave multiple full honey supers on the hive in the summer. If my bees fill a super with honey during the summer, can I take it then and give them a new box with frames, or...

I am a first year keeper from eastern Virginia and my bees are booming. I started with a 3# package of Italians in an 8 frame deep brood box with foundationless frames in late March. It took them about 4 weeks to draw out roughly 80% of the box and I then added a medium brood box. It has been 2...