Can a guy put more than one wire (2) under the screw on the ground and/or neautral bar. I am running out of open spots but have a few more breakers to put in. Home service panel. While I am at it... all the white wires go to the neutral bar and all ground/bare wires go to ground bar, right?
Thanks

Can a guy put more than one wire (2) under the screw on the ground and/or neautral bar.
No, but a lady can. We let them do whatever they want. :D

OK, seriously. You typically can put two or even sometimes three grounds, of the sme size, under one screw. Neutrals are always one to a hole.

In the main panel, as in main breaker panel, there is no neutral or ground bar. They are one in the same, regardless of how anyone makes the connections.