Domain vs meta tag,H1,Title elements

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Domain name vs metatag contents
I understand its extremely variable as to what degree each search engine uses metatags. Apparently Google doesnt use metatag recognition much.
So what's one suppose to do when trying to improve domain recognition on the few top search engine sites?..What..google.yahoo etc. please fill in

And related to that,what areH1 elements and Title elements(words?)
John