To start with, it needs to be understood that in Counter-Strike: Source (CS), there are several different map types. This type are:
Bomb Map (de). The Terrorist goal within a bomb map is always to go to a unique location (marked in your map) and plant an explosive. The explosive is on the timer, so once it really is planted, you should defend it until detonation.
The counter-terrorist goal on bomb maps is to avoid the terrorists from planting the bomb without exceptions. This can be accomplished through the elimination of all of the terrorists, defusing the planted bomb, or (in some instances) defending the bomb site until time expires.
Hostage Rescue (cs). In hostage rescue maps, the main goal for counter-terrorists would be to rescue hostages captured and held through the Terrorists. You may also win by eliminating the terrorist team.
The Terrorist goal is to simply avoid the counter-terrorists from rescuing the hostages through the elimination of them, or maintaining power over the hostages until time finishes.
Bomb Maps – Counter-Terrorist. Being a counter-terrorist on bomb maps, your best bet (by far) is always to get rid of the terrorist team before they’re able to plant the bomb. Defusing the bomb allows you to a sitting duck, which is a scenario you would like to avoid. Keeping the terrorists seeking to plant the bomb means you get to remain on the defensive, that gives you an advantage.
Bomb Maps – Terrorist. As a terrorist, your main goal is to completely overrun a bomb site. If you can not manage a bomb site inside first Thirty seconds, your team may lose the round. The best approach is to rush everyone on a team except for Two or three (tops) to a single site. The opposite few players will behave as a distraction on the other site, and so the counter-terrorists guarding it are not equipped in as re-enforcements.
Hostage Maps – Counter-Terrorist. I have found the top technique to be spreading the group out and attacking from all of angles. Coordinate a simultaneous attack when possible, but make sure nobody just “runs in, guns blazing,” because that technique almost guarantees death inside a hostage map.
If one side in the attack manages to punch through and get inside the area under Terrorist control, the remainder of the team should turn to that area in order to assist the attack.
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