: Isometric,Eccentric,Concentric training differences and what each is good for? As in the title I wish to know: What each of them is? What each of them is good at?(muscle building ,strength building,resistance building,etc.)

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First, some definitions:

Muscle length is (for practical purposes) the distance between a muscle's origin and insertion.
Isometric ("same length") muscular contraction occurs without a change muscle length.
Concentric muscular contraction occurs with a decrease in muscle length.
Eccentric muscular contraction occurs with an increase in muscle length.

Replies to your questions:

You could identify or contrive exercises involving isometric, eccentric, and/or concentric contractions, and build a training program upon these exercises.
Each of these types of muscular contraction can be trained to increase strength ("resistance"), and therefore muscle size.
Most strength training exercises (and, therefore, training programs) will include all three of these types of muscular contraction, because they are how muscles work. For example, in the squat, the glutes and quadriceps (among other muscles) undergo both eccentric and concentric contractions, which the trunk muscles (for example, the spinal erectors and the abdominal muscles) undergo mostly isometric contraction.
Eccentric contractions tend to cause more muscle soreness than the other types of contractions.
The bench press involves both eccentric and concentric contractions of the triceps and the pectoral muscles, and isometric contractions of the spinal erectors and the abdominal muscles.
There aren't incorrect ways to execute these types of muscular contractions.