Server-Side vs. Client-Side
When you make a change to a website you probably want it reflected on Google & Bing instantly. Unfortunately, it takes time for Google or Bing to see your new webpage or new content. Rendered content takes even longer because it is put off until Google has the resources to handle the render. So, the best thing you can do for your website is to make sure that important metadata exists on the server-side of your website in HTML.
Using Hero Elements for SEO
A hero element refers to any element that answers the question of content intent. Is the content transactional (a product), informational (a blog), or something else. If you have transactional content your hero elements are product name, product description, product price, and product availability. If you have informational content your hero elements are the post title, post meta description, and tags/categories. You want to make sure these elements are rendered on the server-side so they are caught in that first round of indexing. Similarly, any schema markup you create is better placed on the server-side.
The Importance of Sitemaps
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