How to find and use vector files on the Internet? I found a font and said it was calligraphy.

Download the file, don't click Open. The safest way is to copy and paste the file into the folder C:\Windows\Fonts. If it is a legal font file, it will be automatically installed in the system. You can find this font in the font settings. If it is not a legal font, it will not be installed (the copied file will be deleted).