Start a free keyword-volume check with three sources: Google Keyword Planner for estimated monthly searches, Google Trends for patterns in demand and Search Console for the queries where your website already appears. They measure different things. An impression of your site is not a count of every search in Belgium, and a trend chart is not an absolute monthly volume.
Below, choose the right tool, set the location and language, and create a small keyword list you can use to improve a real page. You do not need to begin with a paid SEO subscription. Keep the intended customer question beside every number so the research leads to a useful answer.