Important Keyword Metrics
Keyword clustering is when you segment your keywords into relevant groups. This helps you to categorize your keywords and helps you to create a content and internal link plan around it.
Keyword density is the number of times a keyword appears on a webpage or within a piece of content. The ratio or percentage is based on the overall word count and should be subtle.
An SEO metric that estimates how difficult it would be to rank on the first page of Google for a specific keyword. You can find this metric in many popular rank tracking and keyword research tools.
The process of tracking the movements and ranking positions of a specific set of keywords in order to determine its visibility in relation with your website. This is done with keyword tracking tools.