If you don't know yet, SEO is a bit of a joke. Think about American TV networks. They do market research and everything else before launching a show.They think they know what's hot. They put the show on the air and it flops. Meanwhile, some idiots acting like fools film everything they do. Then you get a hit like "Jersey Shore". What's hot today is cold tomorrow
Research keywords for a hub? What's the payoff. Just write and the keywords take care of themselves. It isn't SEO to write about gifts for teenagers near Christmas, Hello?!
Do you like the way I worked TV into my answer?