The product that will give life to mushrooms always has to be kept wet. For this reason, if it is located in a wet room, it just needs to be watered once every two days, otherwise if the room isn't moisturized enough, it must be watered even twice a day.

No, they can't because Boletus variety appear spontaneously in woods and live in symbiosis with plant species.

Mushrooms have to be rolled as to cut the whole stem off and at the same time avoid damages to the underlying substrate. If you don't cut the stem off it could rotten and consequently attract midges.

As they grow up, mushrooms live on the composting organic matter of the straw; for this reason, it is not worth seeding again because the straw has run out that rich material.

No, you don't! :) Mixed with land soil it is a great potting compost for your the growth of your plants.