How do they make grape juice into wine?

i dont get how they do that.... i seen they stomp on it and than leave the juice in a barrel and it becomes wine??? Do they mix rubbing alcohol in it to make the grape juice wine??? And is it true the longer its in a barrel the better it taste? Doesn't it get fungusy after a while because i remember i had some... show more i dont get how they do that.... i seen they stomp on it and than leave the juice in a barrel and it becomes wine??? Do they mix rubbing alcohol in it to make the grape juice wine??? And is it true the longer its in a barrel the better it taste? Doesn't it get fungusy after a while because i remember i had some apple juice in a bottle and after a month it got some fungus inside the bottle.
Update: lol i did drink it a bit before i realised there was fungas in it... i spat it out and was pretty sick.
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