h1 is for headline

h2 is for secondary headline and so on until h6

img is for adding an image, src is where the image coming from
a is for adding a link, the href points to the URL. the link text is written between the a tags
table is for making tables it is possible to make a nested table
(a table within a table) and even
insert a list to a table
tr is for making new rows td is for making new cells in a row