One Keyphrase. Ideally, a keyphrase should comprise of 2 to 4 keywords.
The maximum recommended keywords are four words per keyphrase.
Each page should target one keyphrase. However, there can be various search terms for the keyphrase.
As an example, the key phrase for this article is “SEO Interview Questions“.
The search term a user may type can be anything related to the phrase like for example: “what are common interview questions being asked for an SEO position”