The guides describe Google's standard for their own content. It's very likely that Google will think that your web pages are high-quality pages if they meet these standards. Here are some key points from the documents:

Recommendations for your content:

• Aim for a voice and tone that's conversational, friendly, and respectful without being overly colloquial or frivolous; a voice that's casual and natural and approachable, not pedantic or pushy. Try to sound like a knowledgeable friend who understands what the reader wants to do.
• Use standard spelling, grammar, punctuation and capitalization. Write short and concise sentences that are easy to understand.
• Use descriptive link texts, i.e. "download the user manual" instead of "click here". If you link to other websites, make sure that these websites are reliable and respectable.
• Avoid buzzwords and technical jargon. Don't use exclamation marks, except in rare really exciting moments.
• Consider numbered lists and bullet lists to structure your content.

Technical recommendations:

• Use tables and lists when appropriate. Only use tables when you have multiple columns of information.
• Use optimized .png files or SVG files with ALT text for images.
• Use HTTPS to embed resources such as images, media files, CSS and scripts on your pages.
• Use HTML to structure your page and use CSS to style your page visually.