When using analytics programmes on your website,which of these do not fall under the category of a metric?

Browser users use to access your site" is a dimension, not a metric. A dimension describes characteristics of your data (e.g., the browser used, the country of a user, the page visited). Metrics are quantitative measurements (e.g., number of unique visitors, time spent, bounce rate, revenue). "Unique visitors to your site" and "Time users spend on your site" are both quantifiable measurements, making them metrics. Understanding the difference between dimensions and metrics is crucial for interpreting analytics data correctly.