I’m making a platformer on unity2D and need a way to anchor a platform in place, (Keep it in the air and not have the player knock it over if they hit the side of it) can someone help me 
If your platform has no RigidBody2D, then it cannot be moved around by physics and won’t move when the player touches it.
If your platform needs a RigidBody2D for some reason, then you can set the Body Type to “Static” and it will not move.
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Also, if it needs to move but must not react to collisions, you can use the Kinematic Body type