Why is it a big deal that Democrats took the senate if the Republicans will likely take the house?

I don't know much about politics, but don't bills have to go through the house before they are passed? Therefore the Democrats won't really be able to pass anything? Am I missing something? I would actually consider myself a liberal, so I'm not trying to bash on the Democrats.

Why is it a big deal that Democrats took the senate if the Republicans will likely take the house?
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