Newspaper and Magazine ArticlesArticles in newspapers and magazines are a source of information you can use to get an idea of what your competitor is planning for the future, how their organization is run, and what new product information or innovations they have. Journalists may also uncover and reveal unflattering information about your competitor that may prove valuable to you. Be on the lookout for product reviews in magazines; they will reveal a competing product's strengths and weaknesses. Visit a college or public library. The reference librarian will show you how to find pertinent articles online much more quickly and easily than you'll find them by browsing.  
It simplified the ways that an organization can compete into four: cost leadership, differentiation, the focus on cost, and the focus on differentiation. Since the inception of Five Forces there has been a lot of discussion about how helpful the categories are, but it seems to be part of everyone’s strategy and competitive toolbox, especially for MBAs.
Limiting your organization to direct competitors only might lead you to a very narrow view of the market. This framework allows you to evaluate companies that aren’t just your direct competitors but companies that could easily move into your turf. You want to consider companies that aren’t currently in your category but could potentially leverage their product or technology in your space.
As of 2017, there are over 5,000 products in the martech sphere alone competing for business in complex and overlapping ways. Some companies leverage their expertise and resources to enter new markets. Salesforce is a great example; look at the number of martech categories it’s listed in. With so much competition, SaaS companies can't win on features alone; they must win on brand and customer experience.
When using the Keyword Explorer, Ahrefs will also produce the "parent topic" of the keyword you looked up, as you can see in the screenshot above, underneath the Keyword Difficulty meter. A keyword's parent topic is a broader keyword with higher search volume than your intended keyword, but likely has the same audience and ranking potential -- giving you more a valuable SEO opportunity when optimizing a particular blog post or webpage.