2D Oneway Platform

I know this was already discussed but all the threads I could find were pretty old and the methods I did try did not seem to work effectively. Does anyone have the link available for creating a 2D platform that the player can jump through but land upon?

As per @Jinxology “If you are using OnCollisionEnter, then you can check the ContactPoint to see where it hit.” : Unity2D side collision detection - Unity Answers