All too often, people dramatically overthink the most basic keyword research concepts; keyword generation should start simply with answering the question of "What products or services do you sell?" If you sell dog food online, the root words dog and food alone would be very poor keywords because on their own, neither dog nor food do a remotely good job at describing what you sell. Though this example makes it obvious, many times we have to fight through our urge to include those bigger, broader root keywords.
Off-page SEO builds a website’s reputation and authority by connecting it to other high-quality websites. Off-page SEO techniques include: link building (acquiring high-quality backlinks) from other websites and managing local listings and directory profiles. When many websites link to a brand’s website, it shows search engines that the brand’s website is trustworthy, reliable, and reputable, which increases its search rankings.
Additionally, there are many situations where PPC (a component of SEM) makes more sense than SEO. For example, if you are first launching a site and you want immediate visibility, it is a good idea to create a PPC campaign because it takes less time than SEO, but it would be unwise to strictly work with PPC and not even touch search engine optimization.