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I repeat
When you have a hive one brood and one super, it is not really a hive. It is a baby hive.
the most important is to live according the brood area and according growing bee amount.
Even if you do not get a single drop honey, you must add room foor bees. Otherwise the hive swarms and escape.
I have had summmers that I have 6 box bees in hives but I need to feed them that they do not starve on canola fields. When canola flow begings, the hive start to fill combs so fast that you cannot follow the combs. 6 box hive may store 60 kg honey and the upper most box will be capped when I add more empty boxes. But that is very different story compared to one brood+one super hive.
A small hive is dangerous to the beginner. On canola fields a small hive fill itself in few days and then it swarms without warning. A beginner has no experience to prevent happenings.
If yu are not sure, when to enlarge, give a foundation box under the brood box. Then super on.
The bees can move honey from brood frames up to super and then bees can enlarge the colony down warms.
When lower box is half full brood, then turn around boxes. Or if it combs are drawn, but does not have brood, then turn boxes around. That prevents swarming.
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When colony has 4 boxes, it is capable forage a good amount honey. It depends then on pastures.
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