What makes a website search engine-friendly?

Hi Guys,
I have one important question and need prompt and detailed answered please.
What makes a website search engine-friendly?
Thanks in advance.

1 Make your Navigation Simple
2 Use Keywords on Different Location
3 URL Should be SEO Friendly
4 Keep your Content Unique and Update
5 Use Professional SEO Tools

write keyword rich seo friendly content , adding keyword rich h1 tags, meta tag optimization.

Mobile friendly web design, and good user experience providing sites become more search engine friendly. Use optimized content, images, h1 tags, meta tags, sitemaps, good page downloading speed etc are necessary factors for this purpose.

use keyword in your content and keep your content unique and meaningful.focus on loading time of your website.use seo tools and techniques to optimize your website.

Strong on-page seo makes a website search engine friendly.

To make a website search engine friendly:

Implement White Hat SEO techniques
Responsive site
Fast page loading speed
Quality content
Backlinks in high DA sites
Internal linking
Easy navigation system
Keyword density

SEO on-page techniques make a site search friendly.