On page optimization started Conditions

On page optimization prior to the start of the criteria we need to know.Down On page optimization is the criteria .
1 . The selection of keywords.
2 . Posted on the site as well.
3 . The site will be minimum 20 posts.
4 . , Do not copy post from other sites.
On page optimization of your site , you will need to select the site for the right keywords . Means that the visitor google search with the keyword that is the keywords.Quality to be able to post on your site.Visitor will make it acceptable to your posts.You have Minimum 20 posts in your site.The last one I remember so your post is not copy from another sites.
These four issues should be kept in mind.Till today .