First of all, I am really new to Blender so the question might seem dumb but I couldn't find something in the internet.
I've just finished rigging a character with all the bones. My question is how you can add bone controllers (the yellow cube, all the circles and arrows) like in the picture below.
I only find tutorials explaining how to add bones or link them to the mesh.
I am really happy that there is such a great Blender community. Thanks in advance.