One of the first things you should learn when adjusting your typography with CSS is about
font stacks. These are the lists of fonts that you would prefer your page be rendered in. Because the Web is not print, you can't easily force text to the font you want. But you can suggest. I have seen font stacks that had more fonts in them than there were characters being defined in the text! And I've seen other sites that just listed one font in the stack - hoping, I suppose, that it was generic enough that most browsers would have it. How many fonts do you typically use? If you choose "it depends" please let us know in the comments what it depends upon. Thanks.
I’ve had times when I make a 10-step stack of fonts and times when I only choose something like font-family:monospace; (or serif/sans-serif/etc.)
So, because of this, I voted for “it depends”.
I try to keep my fonts to a minimum, so as not to strain my photoshop on start up, i do have a large collection of fonts however i only install my faves
Not so much, for header, sub-header and content section. But there are still more, like fonts for small notices, comments, sections and so on, which I use them. Also, is possible to make visitors to have different perspectives and visualisation-looks to page by using the same font, but using other sizes and colors.