A game of Day of Defeat: Source can get quite frustrating if you keep getting killed. The game is not your run-of-the-mill shooter, so it requires a little practice to get good at. Here are a few tips to speed-up your learning process, and help you get better at the game:
Just like most first-person shooters, the guns in DoD:S have a good amount of recoil. For those of you who don’t know what recoil is, it’s the 'kick-back' from your gun when a bullet is fired, and this could end up ruining your aim so in order to fire efficiently, it’s very important to understand the recoil of the gun you’re using. Each gun in DoD:S has a different amount of recoil and it really helps if you stick to one gun/class and get a good feel for it. For instance, The Assault Class guns (M40, Thompson) have a controllable recoil, and you can shoot somewhat effectively even while moving, but the Support Class Guns (St44, Bar) do more damage and have more recoil, so you can’t really use it while running around. So, to get better at the game, I recommend that you stick to playing with one class (preferably the Assault class for beginners), till you’ve mastered it.
Now that we know how recoil works, let’s see how we can improve your accuracy. There are two ways to do this – (1) Going prone/crouching while shooting, or (2) Shooting in short bursts. Going prone is not always the best idea in the battlefield, since it reduces your mobility to a crawl, so your best (and safest) option would be to shoot while crouching. When you come across an enemy, instead of dancing around him and spraying bullets all over the place, you should hit the Crouch key, aim for his chest/stomach and unload your ammunition on him. However, if he’s a little far, you’re better of crouching and shooting in short bursts of 3-5 shots each. Additionally, while using an automatic weapon, you should pull your cursor down slowly while shooting to compensate for the recoil. If you want to get a good feel for your gun, try unloading a whole clip of ammunition on a wall to see how the recoil affects your accuracy.
Nice tips for begginers.Good to see this awsome game gaining in popularity in india. 
