As stated, it’s the literal basics. There’s nothing more basic to SEO than getting content indexed by Google.
Here’s a brief summary of the information included in the guide.
What’s in the Guide
Those tips include:
- HTTP status codes: Use a meaningful status code to tell Googlebot if a page should not be crawled or indexed, or whether a page has been moved to a new URL.
- Lazy-loading: To save on bandwidth and improve performance, use lazy-loading to only load images when the user is about to see them.
Read the full guide here.