what is the command for letting no one to have access on my channel when the user is by himself in the channel?

Answer 1

i would say that one has to be SECURE command. Secure prevents anyone that's not on the channel's access lists from gaining operator or halfop status on the channel. This is useful if you're paranoid.

/msg ChanServ SET #Channel SECURE ON

if you want to turn it off all you have to do type the same command and at the end instead of ON type OFF

/msg ChanServ SET #Channel SECURE OFF