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If the font is CSS file (for example, Google Fonts (https://www.w3schools.com/css/css_font_google.asp)), use <link rel = "stylesheet" href = "insert_CSS_font_link_here" /> (preferably in the <head> tag for the font to load before the page's visible content).
For TTF, WOFF, EOT, SVG (better to use them all for browser compatibility use CSS's @font-face rule (see https://stackoverflow.com/questions/24990554/how-to-include-a-font-ttf-using-css, https://www.w3schools.com/css/css3_fonts.asp).