I really didn’t know until last year, but there are entire websites with available icons, ready to be downloaded!
Useful for graphics, presentations and so on, they are very nice, flat or colored and you can find on these websites:
- https://pixabay.com/it/vectors/
- https://icons8.it/
- https://www.iconfinder.com/
- https://thenounproject.com/
- https://www.flaticon.com/
IMPORTANT: REMEMBER ALWAYS TO READ AND RESPECT THEIR DICLAIMERS AND CONDITIONS!
Disclaimer: this is a fast collection of links, that I found very useful and I want to suggest. In that you can find several icons, different formats, black and white or coloured etc.! Feel free to suggest me other samples!