Answer 1

Hi, you can find a good collection of fonts by Google at: https://fonts.google.com

There are many other sites that offer similar stuff to use on your website, but consider their readability, license and support for your language (many don't have some symbols)

To use them, in the case of Google Fonts, they provide you with a link so you can easily import them through the <link> tag. In other cases you should see if the author provides a method to incorporate it or if you must upload it (in case your website is published on the internet) to a server