Reading some of these comments are a little bit discouraging. I think you should at least understand the core concepts behind the technologies you use. HTML5 is a markup language, Wordpress is a CMS (content management system). They are not mutually exclusive. No one should be using anything other than HTML5 on the web today. People still telling you that they are building "HTML5" sites are just spouting out buzzwords they heard.
If you have limited experience, static HTML sites should only be for things you really don't need to update much. For anything that you will regularly be updating, you generally need a CMS. Pretty much the sole benefit of Wordpress is that everyone is familiar with it and it has a ton of plugins and themes. It is a jack-of-all trades and master of none. There is also the possibility of using a flat file system such as Grav or Pico which can be faster than database CMSs.