This video perfectly explains which Smash Bros. character is right for you
"Maining a character" is what people refer to in the competitive scene as, well, using one main character for the large majority of your gaming. Many top professionals are defined by their mains, just look at Juan “Hungrybox” DeBiedma: His Jigglypuff skills are unlike anything else out there.
Before we fall too deep down the esports rabbit hole, it’s best that you figure out which character best fits to your playing style.
If you have new-to-Smash Bros. friends that continue to play as random characters, show them this video—it should point them in the right direction.