Basic html tags are used for highlighting the text , headings in your article or webpage in order to make beautiful.
In html the reserved tags are H1,H2,H3,H4,H5,H6.
Note:tag names are put in between angular brackets.
opening tag ..... content....closing tag
h1 tag used for main heading :
MAIN HEADING WITH H1 TAG
h2 tag used for subheading heading :
SUBHEADING WITH H2 TAG
Note 1: You can use other tags according to your need.
Note 2: you can also nest bold , italic etc text writing formats with tags .
opening_tag ....italic_tag..... content...italic_tag.....closing_tag
Example : using italic with h2 tag.
H2 tag with italic text format .
Note:In html users are also allowed to create their own tag.
W3schools is one of the popular website to start with html basic to advance level.