It stands for HyperText Markup Language. This is the same type of thing one does when text is sent by an author or publisher to a printer. The web browser Netscape has such an editor built into it. Those of you who have used recent versions of Microsoft Word may have noticed that your Word documents can be saved as HTML documents which can be directly posted on the web. Maybe you don't need to learn HTML to do what you need to do.
Many people do fine without it.
HTML is more like a series of requests than a series of commands. I am asking your computer to display this page as red and black text of varying sizes on a white background. My requests would be superseded by your setup. HTTP stands for HyperText Transfer Protocol. Actually, the web is a part of the internet in the same way that the super highway system is a part of the larger transportation system.