File this under common sense advice, but it’s something to keep in mind when using WordPress plugins. You should always be aware of how they work, what they do, and their current settings on your WordPress based website.
I have the Simply Exclude plugin used on a few of my websites. In fact, I essentially copied the meat of one of my sites to use as the base for my other sites. Unfortunately, I never checked the Simply Exclude plugin settings, and I had blocked a specific type of page on my site. Upon replicating that particular page over and over, I was creating pages that blocked search engines from seeing them. They aren’t critical pages or advertisers’ pages, but they are important. Bozo move on my part.
The good news is that I caught this error and can advise you on not doing the same thing. The other good news is that upon allowing search engines to see those pages, I should see quite a jump in traffic. The bad news is that I was blocking certain pages for a long time, which probably cost me traffic and revenue.
Do yourself a favor when you develop. Learn about the features and functionality of all your plugins. Avoid silly mistakes like the one I made.