Optimized URLs: Try to use static and keyword-rich URLs. Should be less than 255 characters and use hyphens to separate the different parts.
Title Tag: Major ranking factor which denotes your headline. Wrap your title tag in an H1 tag
Meta description: It describes your service briefly and should be 120-155 characters
Content: Use long content and your keyword should appear in the first 100-150 words of the article.
Keyword: Have a keyword density of atleast 1%
Image optimization: Use appropiate size of images with alt text, caption and description
Internal link: Interlinking pages on your site can pass their strength between them
Outbound links: Linking to authoritative pages sends trust signals to the search engine
Breadcrumb navigation: It allows users to navigate your website in a structured way
Sitemap: Most effective way to tell Google that what pages your website includes. To generate site map use https://www.xml-sitemaps.com/
Robots.txt: This text file tells the search engine crawlers which parts to web and which parts to leave alone
301 Redirection: This search engine frienly method has lots of usages such as avoid duplicate site, passes 90-99% of link juices to the redirected page, and indicates that an old link has been replaced by a new one
Customized Error page: This 404 error page helps you to redirect your users if they landed on error pages