How Many Type Error Of SEO?

[Jack]

There are many types of error In SEO Like.
404 - Responds with an error, but shows a custom page to help your visitors.
200 - If a page is missing, it's replaced with the custom error page.
302 - If the page is missing, it's replaced with a temporary redirect to a custom error page.
301 - Redirects errors to either a custom error page, or some other page in the site.
But According to me there are 7 critical error in SEO which gives the bad effect on on our Sites.
which are..
1)Lack of Product Description
2)Using Product Descriptions from Manufacturers
3)Lack of Product Reviews
4)Not Optimizing Product Pages Based on The Search Demand
5)Non-Unique Titles
6)Lack of “Speaking” Urls
7)A Lot of Duplicate Content