Mo’s a plumber with a responsive website.He wants to make sure he'susingthe right keywords for his mobile SEO.Which online tool could help him identify which keywords would be most effective?

Google Keyword Planner is the correct tool because it's specifically designed for keyword research. It allows users to discover new keywords, see average monthly searches, and analyze competition, which is crucial for identifying effective keywords for both desktop and mobile SEO. Google Analytics, while a powerful tool, is primarily used for tracking website performance, user behavior, and conversions after keywords have been implemented, rather than for initial keyword discovery and planning.