Hashtags, Good News, Hashtag, And Way

I see everyone using hashtags. Do they actually work? I just don’t get it. Help!
Dear Hashtag-Hopeless,
Do you want the good news or the bad news first? The bad, you say? Okay, then: Hashtags are here to stay, so you’ve got to get on board. But the good news is, I’m about to give you a crash course …