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When choosing a font, you have to use something that everyone has on their PC. So generally you want something clean and easy to read which means you've really got a choice of Arial or Verdana (or Times New Roman if you like - but it's hard to pull off). If you use a font you have installed on your PC and the viewer doesn't - they can't see it.
Then you specify the font to be "Arial, Helvetica, sans-serif". That tells it to be Arial first and it'll fall back through the list if the user doesn't have that font. So anyone without Arial gets Helvetica (i.e. mac users) and if neither of those are available, it defaults to whatever their browser's default sans-serif font is).
Also, if you use a cascading style sheet (CSS), you only need to define the font that's used once then reference the stylesheet into each html page. Then all you need to do is edit that one CSS file and you can alter the font used on your entire website, propagating through every page that references the CSS file. You can define the look of your entire site in that one file, making it really easy to make adjustments to the style and layout of your site with very little effort.
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