The fonts are classified to make the page easier to scan. Fons are most important part of designs. Good fonts make your design more creative. You have to pay for the best fonts like Helvetica or Univers for quality fonts that are perfectly suitable for professional design work. But there is also many free fonts. I have founs amazing free fonts and added it in this post for share with you.
Note: Please note that some of these fonts are for personal use only, make sure you always check the license before using the font.