So, let's go into the heart of it: how to be good on counter-strike 1.3? Number 1, Brightness. Enemies are hard to see with the default brightness of the game. Meaning, if you are not the server of the game this is a necessity (this might seem unnecessary but trust me it is. It sounds senseless but it is not). So, to be able to do it, type "map de_dust" on the console. Wait for the console to take you to (guess where) de_dust. After, click ~, and type and enter on the console "brightness 999." After that, enter "map de_dust" again. Wait until it gets you to de_dust again. Just now, it has the perfect brightness which will surely help you differentiate someone who is your enemy and friend on the game.
Number 2: Controls. Before even starting to play download counter strike 1.6 the game, go to the controls part. Click defaults. After that, change how you can buy with F1 instead of B; and how to buy bombs with F4 instead of M. For those of you who are curious, this would make you buy weapons, ammunition, and bombs faster which will make you more efficient on the game. Note, buy ammunitions with F1 + 6 and F1 + 7, instead of the alternative version. Trust me on this.