How do I make particles in JS

Question

I have seen many amazing codes with a lot of small Spheres moving around
Can anyone tell me how to make them

Answer 1

Try particles.js library
https://github.com/VincentGarreau/particles.js/

Answer 2

In this example you can good see live and analyse how it can be done:

https://code.sololearn.com/WC7OD8xAde5m/?ref=app