QUOTE: “Returning a code other than 404 or 410 for a non-existent page (or redirecting users to another page, such as the homepage, instead of returning a 404) can be problematic. Firstly, it tells search engines that there’s a real page at that URL. As a result, that URL may be crawled and its content indexed. Because of the time Googlebot spends on non-existent pages, your unique URLs may not be discovered as quickly or visited as frequently and your site’s crawl coverage may be impacted (also, you probably don’t want your site to rank well for the search query” GOOGLE
Keep resources crawlable. Blocking page resources can give Google an incomplete picture of your website. This often happens when your robots.txt file is blocking access to some or all of your page resources. If Googlebot doesn't have access to a page's resources, such as CSS, JavaScript, or images, we may not detect that it's built to display and work well on a mobile browser. In other words, we may not detect that the page is "mobile-friendly," and therefore not properly serve it to mobile searchers.

These cloud-based, self-service tools have plenty of other unique optimization features, too. Some, such as AWR Cloud and Searchmetrics, also do search position monitoring—which means tracking how your page is doing against popular search queries. Others, such as SpyFu and LinkResearchTools, have more interactive data visualizations, granular and customizable reports, and return on investment (ROI) metrics geared toward online marketing and sales goals. The more powerful platforms can sport deeper analytics on paid advertising and pay-per-click (PPC) SEO as well. Though, at their core, the tools are all rooted in their ability to perform on-demand keyword queries.

Other research shows that exact-match domains that are deemed to be relevant, valuable, and high-quality can see a ranking boost because of it. However, if you already have an established website, you don’t need to go looking for an exact-match domain for your business; focus on a URL that reflects your business and optimize the heck out of it instead!