The forum does have various boards in which you can interact to get or/and share opinions, facts, etc. Bitcointalk also offers local boards in which you can freely use your country's language.
Not just learnings. You can also participate on auctions, games, and competitions, get/offer jobs and services, lend/borrow money, etc.
newbies cannot message other members, they are restricted by default but ranks above can make use of this feature and communicates effectively.
Am not sure if buying corper membership rank could help evade this
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Not so sure too, but I since copper membership is equivalent to member ranking account's features, then I bet they can be able to send message, not being restricted.