trying to get back into programming.

Forgot how to center a title or header using HTML

From what I understand <center> </center> Does not work

If you mean title as in what is shown in the tab of a browser you can't center it (or at least I have no clue how).

If you mean just text there are a few ways to do it.
<div style="text-align:center">BLAH</div>

is the way I tend to do it if I am not using a css.

Just link a stylesheet through the html and make all your edits there. <center></center> won't work