Since heading tags typically make text contained in them larger than normal text on the page, this is a visual cue to users that this text is important and could help them understand something about the type of content underneath the heading text. Multiple heading sizes used in order create a hierarchical structure for your content, making it easier for users to navigate through your document.
As a simple example, I recently renovated a Victorian-era house in the UK, and throughout the process, I was looking for various professionals that could demonstrate relevant experience. In this case, having a well-optimized case study showing renovation work on a similar house in the local area would serve as great long-tail SEO content — it also perfectly demonstrates that the contractor can do the job, which perfectly illustrates their credibility. Win-win.
Use your keyword list to determine how many different pillar pages you should create. Ultimately, the number of topics for which you create pillar pages should coincide with how many different products, offerings, and locations your business has. This will make it much easier for your prospects and customers to find you in search engines no matter what keywords they use.
Every website should have a content strategy focused around your top keywords. When you create content such as blog posts, videos, whitepapers, research reports and webinars, it gives people something to link to. In addition, the content you create can rank by itself in the search engines. For example, if you write a blog post on “How to Pick an SEO Company,” there is a possibility it will rank for some of the keywords you use in the title and in the body post, especially if the post gets linked to from other websites or shared a lot on social media. It also helps if your website as a whole already has significant high-quality links.