Follow the below tips to provide quality contents.
Avoid spelling and grammatical errors in your contents.
Do not embed text in images, it will make it hard for the users to copy it and also the search engines can not read it.
Stick to the same topic. Avoid dumping large amount of text with different topics in to the same page.
Use unique contents, don't copy contents from other websites.
Don't use duplicate contents or near duplicate contents in different pages of your website.
Don't create contents for search engines, create contents for users.