I don't have the patience to write a real guide right now, so...

The Gravity Hammer is your primary dueling weapon and used for mobility. The Energy Sword is used as bait or to take out Grifball holders.

Left Click and then jump with the hammer to propel yourself best. Timing varies based on the distance you want.

You can also use this "Gravity Jump" after attacking an opponent--if you accidentally click too early in a duel and expect to be punished, jump after attacking and you will retreat safely. You can also do this after a kill if the Grifball holder runs past you.

If you're caught up close after swinging with the Gravity Hammer, you can do a basic melee attack faster than a regular hammer attack would ready.

While holding the Grifball, here are some basic strategies: you can either push behind your team if they are aggressive, or stay far enough so that the enemies will put away their energy swords and then jump over them. Experiment and learn from deaths.

In Grifball Dash, the Evade ability is used for mobility. The Sprint is used to aid combat and bait early parries from Grifball holders. Additionally, the Grifball holder can Sprint, while they cannot Evade. Evade can be used to quickly get into attack range, but a skilled player will kill you during the roll.