Are you displaying the message that your site visitors are looking for the instant they land on your blog? The one that lets them know they’re in the right place?
That’s your tagline. It’s what instantly communicates to people that you’re the resource that addresses their problem from a general standpoint.
No matter what the specific urgent need, people will look for a general signpost that says “Welcome, you’re in the right place and heading in the right direction.” This has to happen before anyone subscribes or buys, and even before anyone devotes time to reading your content.