Hey guys
As far as I know Slic3r and Cura are the most used Slicers.
Slic3r is "the original" slicer that was developed with the first 3D printers and has just about every setting that exists => might be confusing
Cura should be simpler but with more hidden options.

https://www.youtube.com/watch?v=USA29CuYOvk

This is a video from Maker's Muse comparing the most popular silcers, its very good!

quertz