Google Analytics is a powerful tool for measuring website performance, but setting it up can be challenging, especially for those without prior experience. To get started, one must obtain a unique tracking ID from the Google Analytics home page and follow platform-specific instructions to add the tracking code to their website. For custom-built websites, developers can use the provided Global Site Tag code to add it to the global code that appears on every page of the site. Other platforms like WordPress, Wix, Squarespace, HubSpot, Shopify, Weebly offer plugins or built-in functions that make adding Google Analytics tracking easier. Once the tracking code is added, users can monitor their website's performance and make data-driven decisions to improve their online presence.