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

You need something that'll render your graphics, since js is in the tag, I'll suggest the use of the HTML5 Canvas.
Create random sphere with random velocities and that's all
https://code.sololearn.com/W4BhdlGDum5E/?ref=app

Answer 2

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

Answer 3

In this example you can good see live and analyse how it can be done:
https://code.sololearn.com/WC7OD8xAde5m/?ref=app