well undetected hack are external box esp, if you have windows xp watch for the one that is compatible with xp user if you got vista or windows 7 use the external box esp 5.1 ( bigradar ) but you got to get your vista/7 in aero mode.
Also stat changer are for the lvl and your stat in barack ( all undetected if you do it before entering a game and close the hack before too )
vac-chaos is a vac2 disabler mostly working for some but with risk of ban
steamloader 1.21 is same as vac chaos but presently maybe better since no ban are said about it.
texture hack arn't bannable, valve just told it himself so you can use the one made by the THT it work and is really good.
other hack like aimbot that arn't external will need you to get vac-disabler but pubnlic are mostly bannable and also you need to be host to play with a vac disabler or you get kicked.
hope you got your awnser