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Yep, more information would be helpful to answer your question.
In general, people tend to overwater their plants. Cannabis is capable of dealing with a lot of water, but they don't like to put their roots into a swamp...
If I was watering by hand, I'd prefer to water them "shortly" (which is a rather vague definition) before you are able to notice that osmotic pressure is declinging. From there on you can move in the "goldy lock zone" of watering. I say that because I like to keep my soil not too wet so I don't introduce gnats or other pest.
You shouldn't cause water shortage or intense wilting, respectively.
In general and in my experience the position and look of the leaves is the best indicator.
The best is to watch the plant, often, so that you get a feeling. Container size, grow medium and variety of your plant play a role.
The leaves drop shortly after you watered the plant -> too much water.
You did not water for a while and the leaves are dropping -> plant is thirsty.
Also, dropping leaves due to overwatering look different than due to having not enough water. At least that is
what I observed. When overwatered the leaves drop, but they also curve/bow (I don't know what the correct word would be). When the plant is thirsty the leaves drop, but they do not change their structure.
Right
I try to avoid being surprised by a much lighter container by acting a little bit earlier. Something that with the current temperatures has a certain error rate
Matter of practice, you will get it with the experience and time.
I'm growing I'm Coco, so no worries about overwatering. Usually these days I'm feeding 3 times a day, small amounts. With one overflow every 1-2 days. Not sure about tactics for soil tbh.
Eventually it may be the more sophisticated way, that is using hygrometers and automatic watering. I guess a constant moisture level is something to aim at and being able to control this. Nowadays this would be not too complicated and as an old IT guy I will think about it.
But I like the time with plant watering it, also I like spray watering. I think the distribution is more even doing this and I have even more time with the ladies