Chest muscle building is only a part of the entire bodybuilding workout program. Some will say that it just might be the most important one, because large, strong and bulked up chest helps out with almost all exercises that include torso, back and arms.
There are two main muscles on each side of torso called pectoralis major and pectoralis minor, and they are shortly called pecs. But not just those two, all muscles in torso area should be bulked up, including the abs. Even though they belong to different muscle groups, building pecs without abs is pointless and it might even look ridiculous at some point. For great looking chest, main back muscle called latissimus, should be built up too, because its wideness emphasizes chest even more.
Since pecs are not easily built up, maintaining them is hard. Not only regular exercise, but also strict and balanced menus are needed, particularly those that have enough proteins for sustaining muscle mass of chest and other areas. Fat might even bulk up chest some more, but fat is not as hard and firm as muscles, and when it comes to looks and functionality, it is completely useless. And bodybuilding is about building muscles, not mass only. As for the supplements that might help with the process of bulking up chest, regular muscle gainers containing creatine are standard products needed for every bodybuilder, and there are also testosterone hormones, ATP sources, and fat burners. All those help with inducing muscle growth in entire body, including chest area.
Bench press is a standard and basic exercise, used for bulking up chest. There are many variations of this exercise and each has to be done in order to fully enhance chest muscles. As for some specific techniques, standard one would include doing sets with 6 to 10 reps, with the increased weight in each set. Some will say that, when maximum weight is reached and lifted once or twice, reverse sets should start with decreasing the weight. When lifting big weights it is smart to have someone standing near you who can grab the barbell if the weight simply becomes too heavy for a beginner.
Muscled and great looking torso is very important for bodybuilders, especially those who enter competitions. Without that specific area developed maximally, no big result can be achieved. Unfortunately, if exercising and healthy eating habits stop at some moment, chest muscles are among the first to deteriorate.