Few Imporatant Factor of On Page Search Engine Optimization

URL renaming/re-writing :-

URL rewrite helps one to increase the visibility of their site by making url understandable in human language which are highly recommended by search engines as well.

Let’s Say an example :- This is a URL : - www.abc.com/about12ourcompany0123.html
This is wrong, we should rename the URL as relevant to our title and avoid numeric digits as this reflects bad results to user.
The Correct URL is www.abc.com/about-our-company.html

You can also add at least one keyword in Url (If possible) because when you hit any keyword in search engine it also bring that URLs in SERP that consist keyword.

Duplicate content :-

Duplicate content is a term used in the field of search engine optimization to describe content that appears on more than one web page. The duplicate content can be substantial parts of the content within or across domains and can be either exactly duplicate or closely similar. When multiple pages within a web site contain essentially the same content, search engines such as Google can penalize or cease displaying that site in any relevant search results.
  
H1, H2, H3 Tags :-

H Tags Optimization (Eg: H1, H2, H3),  An important part of SEO, which helps you to make the robots understand that what is more important in your website and what is less.

Anchor Text :-

The anchor text used to create hyperlinks of your website always helps you to rank better for those anchor texts, so try to use keywords as your anchor text to create links, internal or external. Using keyword in your anchor text must be user friendly (not spamming). You can also use Call to Action i.e., Click Here, Just Visit this Website, Click Here for Instant Access.