Go and check out the documentation and tutorials here:
https://www.procedural-worlds.com/products/indie/pegasus/pegasus-tutorials/
And also the video tutorials playlist here:
https://www.youtube.com/watch?v=dDCoINL98BU&list=PLckEMv5tz0E6w7zlwP1ukA-DrDacPGZiA&index=2&t