Meta tags help Google to better understand what your web pages are about. Google relies on meta tags to understand the relevance of your content to a given search query. The role of meta tags has changed over time in Google’s ranking algorithm.
A 301 redirect is used when you want to forward your domain to another destination URL. When the users type in the domain in the address bar the 301 redirects will send the visitors to the destination URL. The new URL will show up in the browser address bar.
When you add Structured data or Schema Markup to your content it helps the search engines to better understand your content. You can add Schema to your articles, products, pages on your website and more. This helps your website to stand out in the search results.