I have a cylinder which I've extruded like so:
I want to convert those edges to be curved like an arc inwards like so:
Such that the entire bottom section is curved (the faces along with the edges).
Note: beginner
Make the bottom shape like this
Select this edge loop
Hit ctrl-b to create a bevel and play with the Shape slider
You can turn on Clamp Overlap and adjust the Width to get it to go all the way to the outer edges