I’m unable to understand the difference in the results of the above two mentioned tags. The outcomes for the both is similar.

so basically I’m trying to teach myself html and would love a full list of every single tag as a resource but every page I’ve looked up so far that claims to list all 142 elements (which they say is the total number) doesn’t seem to include the robot tag or google site verification tag for example. Obviously then these sites are not actually giving full comprehensive lists of all available tags. Can someone point me to a page that does ? I’m also willing to buy a book if anyone has any reccomendations there.