Problems using bone symmetry in Blender 2.80 I did what was taught in this tutorial:

https://www.youtube.com/watch?v=ovzG9T5KKso

I selected the bones on the side that I made, right-clicked and selected the symmetrize option:



But it did not work:



I tried to do the bones on both sides at once, but I didn't know how to do that in this version of blender.

If I'm not mistaken in previous versions, it was just extruding using shift/control (I'm not sure which of the keys exactly) + E.
To be able to symmetrize, the bones must have suffixes like _R or .R or _L or .L.