If there is a particular game you want to learn do they hace people available to teach it?

Yep

They're very knowledgeable

Definitely, if they have time.

We can help answer questions about games if you play any of our demos or if you have some questions about a game you already purchased. We also have a Euro Board Game group that meets at Guardian every other Sunday (today being one of the days)

I don't know about other games, but there's an Adventurers League group on Meetup that lists public play times / groups where you can learn to play D&D. Not sure about other games.

I believe so.

Yes