Hi. As a writer I always need to ensure that I've wrapped up my plot and any sub-plots that are in my stories. Unless I'm writing a serial I need to make sure that I've resolved the conflicts and given my readers a complete story and answered their questions. I want them to leave feeling good about the story...and come back for more.

Your website posts should do the same. This is not just a call to action but also making sure that you've answered any of the questions you've raised or that your reader has. Go back to your opening premise, what your post is about. And then make sure your conclusion wraps everything up. You shouldn't leave your readers wondering "what happens next"...your post is not a cliff-hanger.

Your conclusion should not be too long, either, that's what the body of your post is for. Present your arguments (your story) in the middle and then finish strong by making sure your reader has the information they came looking for. It's easy to lose focus on what the post is about so do this: your opening statement or question tells your reader what the post is about, the middle presents your rationale or research, and the conclusion states the answer in a simple yet powerful way that ensures your reader found the answer they were looking for. The conclusion should stand on its own, which works for those readers who like to scroll down and "read the ending first".

Don't leave your reader guessing...finish your post and leave them happy.