In the past, SEO experts used direct submissions and SEO tools to get links. These outdated tools and tactics are no longer useful. In fact, a few of the old techniques can actually attract penalization from Google. Today, most webmasters are well versed with the advanced SEO tactics to find link building opportunities but analyzing these activities through Google Search is a whole new ball game.
To remain on top of this game, you need to be well versed with the search operators. Search operators enable you to clear the clutter from your search and make it more effective. This infographic from SEO Optimizers narrows them down.