How do I do this for counter-strike?

Someone told me putting these things (commands I guess) somewhere will help my performance. Where do I put them exactly? What is the Autoexec.cfg and how do i acces it?

  ---Put in Autoexec.cfg---



// _Set netcode settings_
// _adjusts hitboxes and netcode settings for optimal registration_

cl_cmdbackup 2
cl_cmdrate 101
cl_interp 0.01
cl_interpolate 1
cl_lagcomp_errorcheck 1
cl_lagcompensation 1
cl_updaterate 101
cl_smooth 1
rate 25000

// _Set violence settings_
// _increases blood to help you see hits better_

violence_ablood 1
violence_agibs 1
violence_hblood 1
violence_hgibs 1

//Crosshair Settings
cl_crosshairalpha 999 // _bright crosshair_
cl_crosshairusealpha 0 // _enables adjustable crosshair brightness_

// _Set various settings_

budget_show_history 0 // _disables history graph_
jpeg_quality 100 // _high quality screenshots_
mat_monitorgamma 1.6 // _maximum ingame brightness_
net_graph 3 // _enables net_graph 3--CAL required!_
net_graphpos 2 // _adjusts netgraph position-set between 1 and 3_
sv_forcepreload 1 // _forces preload to help increase performance_

Thanks,

 g0lden

C:\Program Files\Steam\steamapps\username\counter-strike source\cstrike\cfg\autoexec.cfg

If autoexec.cfg does not exist, create it, then open it up with Notepad. 

C:\Program Files\Steam\steamapps\username\counter-strike source\cstrike\cfg\autoexec.cfg

If autoexec.cfg does not exist, create it, then open it up with Notepad. 

Einhanderkiller

just complementing on the KA name einhanderkiller!