To optimise a web page, there are two main types of keywords:
Primary Keywords – It is the main keyword that should exist on a webpage. For proper optimisation of content, this keyword should come in the first paragraph, headings and subheadings. It should not be overstuffed.
Related Keywords – It is also known as Latent Semantic Keyword. It is a variation of the primary keyword that should naturally appear in the on-page content.
Ideally, it is recommended to mention the other types of keywords used in the SEO vocabulary. They are short-tail keywords, long-tail keywords, and geo-targeting keywords among others.