SEO means Search Engine Optimization which is not directly related with website design or any technical issues, not directly related with frontend or backend development tasks. It is related with the ranking system of websites on Search engines. It helps Search engines to understand websites pages, why those pages are created, what they are suppose to do. For example, if you are a Online Cosmetic Seller and have tons of posts containing images but none of them are well documented, may be human eye will judge those pages as cosmetic related pages, but Search engines doesn't have the scope to understand those pages and as a result, People will not be able to find your products on the Search engines. Almost every website get their client/customer traffic from Search Engine results on a huge scale, that means you will loose so many customers if you are not properly visible to Search engine, As a tricky task, we recommend you to handover the WordPress SEO tasks to experts like us who knows SEO WordPress well and can help you on improving the SEO service of WordPress websites effectively.