I read how to cultivate a mushroom at home, but my question is
1 - How much do we get per square meter in kilograms?
2 - What protections needed to cultivate for better and quality product?
3 - Is there anything which hinders the growing?
This article should answer questions about growing mushrooms: https://www.gardeningknowhow.com/edible/vegetables/mushrooms/grow-mushrooms.htm
Harvest quantity will vary by variety and growing conditions.