Games based on the Source engine will always provide the user with an accessible console for debugging, modding, practice, or testing. Many source games share the same console commands, making it easier for source developers to transition between games with ease.
In terms of console commands, 1 is Positive, 0 is Negative. The user will have to choose to enter either. For example, "sv_cheats 1" will turns cheats on, while "sv_cheats 0" will turn cheats off.
Allows to user to enter additional commands to show things that would provide an unfair advantage in multiplayer games, such as showing bullet travel trails and live time bullet penetration. This console command can only be used in offline single player.
Restarts the audio drivers of the game, useful for workshop sound mods
(Replace # with a number) Allows the user to set the amount of information being exchanged with the server at once. Setting it lower will decrease your latency, at the cost of somewhat more visual lag on the bodies of other players. Setting this to 60000 is a fine balance to decreasing latency (i.e. "rate 60000")