I'm new guys, how do you do the release grab ? like continuesly. I see people do it
To predict which throw your opponent will use it helps to know the properties of the throws in your opponents arsenal.
For example throws that Ring You Out or wall splat.
Take Nightmares/Siegfrieds crouch throws:
Full Crouch A+G Rings out to the thrower's front.
FC B+G Rings out or wall splats to the throwers's back for some Nasty combos.
So depending on your placement in the ring you can break with A or B to minimize potential damage.
Some throws also do more damage than others so the opponent may favor them.
Or you might want to input the break for them anyway to minimize potential damage.
Brave Edge Throws are strong but require meter, so if your opponent has the meter he might go for the BE throw.
It also helps when you can recognize which throws your opponent uses successfully on you.
That way you may be able to see if your opponent favors a certain throw or has patterns.
You might also want to just keep out of their throw range via movement/pushback as much as possible,
if they can do really deadly throws like the unbreakable Critical Edge Throws mentioned above.
EDIT:
You can also duck throws.
It's not the wisest thing to duck in expectation of a throw because of damaging unreactable mids...BUT
IF you successfully duck a throw punish it as hard as you can. To discourage your opponent from using throws.
It depends on your character, but i think the window to punish them is about 20 frames minimum.
Nightmare for example has While Rising

~ Night Side Stance

:

which does a lot of damage. (58) And can Ring Out.
Some like ZWEI can even reverse RO the opponent for a missed throw.
Edit 2:
You can also evade throws via Tech crouch-, tech backstep- or tech jump-attacks.
Especially because of the evading attacks that can RO like Mitsu's


which almost every character has, it's very risky to use throws when with the back to the edge. Also for your opponent.