Guard break interupt
Press guard break just after the enemy hits you with their guard break but before you are hit with attacks or a throw then you get to have the attack or throw in their stead.
Parry
Most people dont do this right now
If you match an incoming attack with your guard and heavy attack in the moment where the red arrow flashes up you parry the enemy costing them tons of stamina and knocking them back it also throws them on the ground if they run out of stamina allowing you to get a free heavy attack on them.
You can parry even unblockable attacks like the Kenseis top heavy finisher or the Raiders wind up swing giving you a huge advantage and element of suprise when you pull it off as it leaves them Extremely frustrated.
Zone Attack
While many know this one they rarely use it in combat agains other heroes.
However this attack has advantages that you can't have with your other attacks mainly:

• You get to attack all enemies surrounding you at once for a large cost in stamina.
  
• The usually long windup time gets a big tradeoff in range
  allowing you to get hits on enemies that charge into you.
  
• While Zone attacks still match your guard this is not very obvious to your enemy and since
  zone attacks hit multiple times it could catch an enemy off guard when they try to predict you.
  
• Zone attacks can be cancelled by pressing E allowing you to attack normaly after the first attack
  giving you the ability to mixup your zone attack being even more confusing for your opponent.

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The rest is taught very well in the normal tutorial for hero specific help you can have a look at the moveset of what you want to play and their tutorial videos
There is also some things people dont know about revenge mode
It grants you infinite stamina.
More attack power and defense.
(Defense represented by giving your current health a defensive layer that the enemy has to destroy first)
Allows you to attack uninteruppted as long as you are not hit with a specific interuppt.
(Guard break,throws,kicks and so on)
Turns parries and throws into knockdowns no matter the stamina of your enemy.
This allows you to easily knock down people over long distances since a knocked down enemy tumbles farther and gives you the chance to abuse defensive abillties like the all direction shield until someone can help you. You also can trade into enemy attacks and recover allowing you to dish out the finishing move or get the needed execution.
Since blocks are easier when you are outnumbered you should try to be more defensive when more then one enemy approaches you.
(Only the enemy you are focused on needs to be matched with your guard enemies left of you get blocked by having a left guard no matter what their own guard is vice versa for enemies on the right)
Watch your back though! When someone is complety deadcenter and close you cannot block him.