Answer 1

Here some examples Pariket :)
https://code.sololearn.com/WjpRSxo2d87G/?ref=app
https://code.sololearn.com/WuT6SjxvArsr/?ref=app

Answer 2

Hello there Pariket,
I suggest you Google material icons:
https://fonts.google.com/icons
And fontavesome icons:
https://fontawesome.com/icons?d=gallery&p=1
For more:
https://icons.getbootstrap.com/
https://icofont.com/
Just search for icons on Google :)

Answer 3

Tabler Icons
1280 Fully customizable free SVG icons.
https://tablericons.com/

Answer 4

Create your own icons