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The Mac has lots of keyboard shortcuts. So far there is no known data base for all of them. App switching is way easy. It's the Apple (command) key and tab key. Up pops a dock looking panel. Hit the tab key to choice which to switch to or use Apple & Q keys to close highlighted app.
Hogwasher I've tried many times. Never able to get used to nor would I want to use even if it was free rather then $49.00. Some people clearly like it as it's been around for sometime. "Unison" is a much more Mac like and easy to use newsreader. 'Thoth" once the King of news readers on the Mac still works great if you can find a copy. The very moody writter has removed it from the market.