So for many of you this will be a dumb question...
I've brewed a few batches, but starting to get into it more. I hear people talk about 2nd and 3rd generation yeast.
Where\what do I reclaim this yeast from?
How do I reclaim it?
How do I store it?
How long is it good for stored?
How many generations can I use it for?
Also, my neighbor said he harvested yeast from a shelf craft beer. I think he said was the 'gunk' at the bottom. Is this accurate?