How can I ensure my Blogspot template is fully responsive?

To ensure a fully responsive Blogspot template, start by choosing a template designed with responsive principles. Then, verify that the template uses a fluid grid system (percentages instead of fixed pixels for width). Check that images and videos are responsive (using `max-width: 100%; height: auto;` CSS). Finally, test your template on different devices and screen sizes using browser developer tools or online emulators. Regularly update the template and consider adding responsive meta tags in your HTML.