There is a SitePoint article reviewing different plug-ins, which you might find helpful:
I would also strongly advise that you search the forums before posting, as this question has been asked multiple times before, and you may well find there is already sufficient information available. For example:
Best SEO plugins for WordPress
https://www.sitepoint.com/community/t/all-in-one-seo-or-yoast-seo/217651