Netlify is highlighting a different feature each day in December, with the goal of helping users improve their website's performance. Netlify offers various post-processing features to optimize resources, reduce server requests, and enhance SEO. These include snippet injection for adding scripts at serve time, asset optimization via the UI or `netlify.toml` file, prerendering for improved SEO, form detection, and disabling it to speed up deploys. All these features can be accessed through the site's settings page under Build & Deploy > Post processing.