What is HTML?
HTML is the standard programming language being used by websites world over. Its full form is Hyper Text Markup Language. It is non dynamic which means that without the use of another language on the same page a HTML based page is completely static and will be unable to interact with databases. This means that it will not be able to return different information from the same physical file.
You cannot design and develop your website without learning a little bit about HTML. So if you intend to develop and design your own site try to acquire some information about HTML before proceeding.
Even if you are using PHP you will still need HTML code because on its own PHP cannot output anything that is readable to the browser.