On Page SEO has to do with the page itself and how to make it friendlier to search engines and users.
It should be noted that while search engines look at a website as a whole, ranking is performed on a page level basis.
That’s why it’s important to pay attention to the optimization of each and every page on your website.
The most important on-page SEO guidelines are:
Optimize your page titles. This is a critical SEO factor. Page titles are shown in the search results and should be interesting for users to click. The title of a page should also give search engine bots enough clues on what the page content is all about.
Optimize your H1 Tag. While the page title is shown in the SERPS, the H1 tag is what is shown as the top heading of a page. An optimized page has only one H1 tag and usually it has the same values as the page title.
Optimize your headings. Besides the H1 tag a page needs to have sub headings (H2, H3) for the different sections. In case of long form content, subheadings make the page easier to read by users and scan by crawlers.
SEO for Images. Any images used on a page should be properly optimized, otherwise search engines cannot understand what they represent. Things like optimizing the filename, file size and ALT text are critical for image SEO.
Page formatting. Publishing a page with text and images without spending time to beautify the content is not a good SEO practice. Although Google cannot ‘see’ a page like a human, they have ways to understand how a page looks or if it’s full of ads and popups and this is taken into account during the ranking process.