These limits fall into several categories:

1. Title Tag: 60-65 characters
2. Meta Description: 155–160 characters
3. Heading Tags: H1-H6 (use them hierarchically and limit to 1-2 per page)
4. Keyword Density: 0.5–2% (avoid keyword stuffing)
5. Content Length: 500–2,000 words (depending on the topic and purpose)
6. Image Size: Optimize images to reduce file size (aim for <100KB) & The image should be in Webp format.
7. Page Speed: Aim for <3 seconds loading time (Google recommends <2 seconds)
8. Mobile-Friendliness: Ensure a responsive design that adapts to mobile devices
9. SSL Encryption: Install an SSL certificate to secure your website (HTTPS)
10. Duplicate Content: Avoid duplicate content, use canonical URLs or redirects instead, use paraphrasing tools; use LSI Keywords
11. Anchor Text: Vary anchor text for internal and external links
12. Social Media: While important for marketing, social media signals are not a direct SEO ranking factor

Recall that these boundaries are only suggestions and that the best practices for SEO change with time. Concentrate on producing excellent content focused on the user and making your website as user-friendly as possible.