#1: Giving your teammates medical supplies when they need them .

This is very important because I see many players have either a medkit, pills, or adrenaline shot and they're at a very high health. Instead of giving them to players who need them, for example a player with none of those things and they're in the red health zone, they rather keep the supplies to themselves and not help each other out. Left 4 Dead 2 is a team based game that requires you to work together, communicate, and most importantly, share your things. So be generous and give your pills up to someone who needs it more than you.

#2: Sticking with the "lagger".

What I mean by "lagger" is the type of players that are usually always the slowest and are always at the back of the group and struggle to keep up. Tell them to hurry up, but also stick with them. Make sure they don't get smoked, charged, pounced, etc. While a slow teammate could cause frustration, and even sometimes a loss, it's still best to make sure everyone survives. The more players alive, the better.

#3: Keep the same pace as your team

Now, this is for the laggers and rushers. Please, don't get too far from your team. If the team is too isolated, then it's very likely that people can start getting incapacitated and people will start dying, eventually resulting in the round being restarted. So if your team prefers the slower pace, slow down with them. If your team prefers the fast pace, keep up with them.

#4: Try your best not to leave your teammates behind.

I've seen many players go down and others just run off without even trying to save them. My advice is that even if it's a horde, tank, etc, make sure you try your very best to clear the area in an attempt to save your teammate. Try anything in your power to help them, and if you cannot, then in that case it's fine. At least you tried. I've just seen this happening way too much on expert games, in which it was very possible to help the player that went down.

#5: Wait for all teammates to respawn in the respawn closets

Let's say that two players died and you're waiting at a respawn closet. One player appears in the closet before the second one and you open it, realizing that the second player didn't come back. That's because you need to wait for all teammates to appear glowing in the closet. Again, I've seen this countless, and countless amount of times and it's kind of frustrating. Same thing goes for that people open respawn closets before they can even appear. So make sure you wait for all teammates to respawn before opening, please.

#6: Be nice to newer players.

If you're nicer to newer players, they'll be more likely to be more encouraged to keep on trying and find someway to be useful to your team. Everyone starts out somewhere, so make sure you understand where they're coming from when they don't know everything. Just make sure you give them put ups, show them what is right and what's wrong, and they'll remember you as being a great teammate, and maybe then you can form a friendship that way.

#7: Have your volume up and captions on

As suggested in the comments, it's very useful to have these because it allows you to identify special infected. Being able to call out which special infected has spawn in and which direction it may come from is very useful, especially in higher difficulties or in the versus mode.

#8: Be the voice of the team

There's always that one guy who's pretty much the leader. Call special infected out, call out certain items such as throwables (boomer bile, molotov, pipebombs, etc.) Call out efficiently, be the one to tell your team whether to hurry up or to slow down a bit, and everything that a leader would normally do.

#9: Avoid friendly fire.

Friendly fire can not only be irritating, it can also jeopardize the game. Make sure when you're covering your teammates, shoot slowly and carefully. You might say, "What if a teammate is completely swarmed? It's better's to damage them and take out the infected quickly". That is true on easy or normal, but on advanced or expert, that's not the case. Practice how to switch between targets quickly after taking each one down. That way, your teammate gets free and he doesn't take damage.

Also, train yourself to see EVERYTHING. Keep your eyes on the corners, sides, and front of your screen. It sounds ridiculous, I know. However, players have a tendency to run straight into your line of fire. So, while you're shooting, keep your eyes on the targets and be aware of your surroundings. Once you practice and train enough on how to efficiently take out infected and watch where your teammates are headed, it'll feel automatic to stop firing once a teammates passes you and naturally shoot once they pass. You'll be a zombie killing machine; literally.

#10: Don't block paths with gas cans, molotovs, etc.

I have seen this occur too many times where a player would toss a molotov straight ahead, blocking the way. This is especially annoying on expert and in tight corridors where you can't even avoid the fire. Unless there's a horde, please do not waste the precious gas can/molotov or everyone's time unnecessarily. This could result in an actual horde spawning shortly after due to the AI Director detecting minimal progression, or friendly fire.

Thank you all for reading this guide. I will be actively updating this guide with more and more tips, as well as your feedback if you leave any in the comments. Share this guide with your friends or some newer players so they can learn from this!

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