The best way to use a barbell is to perform exercises that utilize the principles of 

Specificity, 
Reversibility 
Overload.
Specificity is the degree to which we match the stressors on our body with our exercise tool—the more specific, the more effective. For instance, a barbell bench press is better for chest development than a dumbbell because it taxes your chest muscles from multiple angles and requires you to hold your body weight above your chest muscles.
Reversibility refers to how well we can reverse the stressors placed on our muscle groups during exercise. It requires strength and balance, which can be trained with bars. It also helps when it comes time for recovery, as most athletes need time for their muscle fibres to repair themselves before they get back into it again.
Overload refers to the extra load placed on muscles during exercise - this could be weight added or decreased or load shifted from one set of muscles onto another. It helps users build muscle and strength while working out. 

Why Use Barbell Exercise?

There are many reasons why people use bars for exercise. 

One reason is that they help build muscle mass.
Another is that they improve cardiovascular fitness. 

If someone wants to lose weight, bar exercises are also great. In addition, bar exercise can burn fat faster than any other exercise.

How To Perform Barbell Exercise?

To perform barbell exercises, the first thing that you need to do is, 

Stand straight with your feet shoulder-width apart.
Next, grab the barbell with both of your hands.
Then, lift the barbell off the floor and hold it above your head. 

Finally, lower the bar back down to the ground. Repeat these steps until you reach your desired number of repetitions.

https://liftdexblog.wordpress.com/2022/11/29/the-easy-method-of-usi...