The web and mobile apps use icons in order to communicate actions, information, and organizational hierarchy. In order to have a beautiful and functional platform or website, great attention has to be taken towards icons.
These are the top resources to find icons for free.
Material icons are beautifully crafted, delightful, and easy to use in your web, Android, and iOS projects.
Font Awesome, the iconic font and CSS framework.
Creating, Sharing and Celebrating the World’s Visual Language.