Common version of HTML are XHTML and the ending version of html is HTML5. HTML5 is followed by all the rules of the XHTML. Currently XHTML is being used more. The HTML we call this word is actually XHTML. so if you learn HTML5 you will automatically learn html earlier versions. The W3C Company Creates and Manages HTML. HTML5 is basically XHTML but here the new tags and rules have been added. since the early days of the web, there have been many versions of HTML:
Versions Year
HTML 1991
HTML 2.0 1995
HTML 3.2 1997
HTML 4.01 1999
XHTML 2000
HTML5 2014
