@jedaisoulJun 17.2016 — #Hi and welcome to the site.
You ask how keywords are implemented, but have given no idea of how much HTML you are familiar with. So it is unclear whether you would understand the answer even if given!
Also, there is plentiful advice on the web about implementing keywords anyway. So it would be preferable if you search Google for "seo implementing keywords" or some such. That would, hopefully, give you the background information, or, at last, clarify how much you already understood.
Then, if you had specific issues that are unclear, please raise a thread, and we will help if we can...