Well if you are reading this then you are looking into the community of Super Smash Flash 2 It is a "ok" community, but with little actual drive. To become pro you will need to follow certain steps before going online and dominating:

1. Learn your characters cancels such as their dash cancels , L cancels , air dodge timing , and perfect blocking
2. Match-Ups are key , most of the time players are out matched because of their characters under tiered skill compared to a very overused character; for example naruto vs bomber man. Naruto is faster and does more damage his combos are easy and they will rarely drop a juggle. Bomber man has no chance unless you spam that probably will not work. So you have to equally match-up to the character; Goku vs Naruto. Goku is stronger , Naruto is Faster , neither drop juggles but goku has more of a close punish method compared to naruto who is a excellent zoning character and does mid damage with the right juggles so it will be a equal match.
3. Stage choosing. I really don't put hazards on but it does help in a competitive setting. If you have a stage where there are hazards try learning how to avoid and leer your opponent into them. It helps with damage and throwing off your opponent.

If you follow these steps your ready to test your skill online Check out my youtube I will be uploading Smash soon it is; Crazy Shinobi Check out my partners youtube Ethereal Dom he is good at smash and has definitely honed some key skills