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.
But there is more… there is also the need to blend what is “optimal” with what is “realistically acceptable” in a basket of digital marketing tools. In particular, SEOs have a tendency to think and often work in isolation. They do not appreciate many of the issues surrounding development processes such as Agile, Scrum, and Lean methodologies. Not understanding these wider engineering concepts, SEOs’ implementations continually lose out to other “more urgent” projects.
Online marketing can also be crowded and competitive. Although the opportunities to provide goods and services in both local and far-reaching markets is empowering, the competition can be significant. Companies investing in online marketing may find visitors’ attention is difficult to capture due to the number of business also marketing their products and services online. Marketers must develop a balance of building a unique value proposition (UVP) and brand voice as they test and build marketing campaigns on various channels.
Search engines attempt to rank results for a given search based on their relevance to the topic, and the quality and reliability a site is judged to have. Google, the world’s most popular search engine, uses an ever-evolving algorithm that aims to evaluate sites in the way that a human reader would. This means that a key part of SEO involves ensuring that the website is a unique and relevant resource for readers.

Inbound marketing refers to a marketing methodology wherein you attract, engage, and delight customers at every stage of the buyer's journey. You can use every digital marketing tactic listed above, throughout an inbound marketing strategy, to create a customer experience that works with the customer, not against them. Here are some classic examples of inbound marketing versus traditional marketing:  https://libertymarketing.tumblr.com/
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