Bug Junior Programmer, Unit 3, Prototype 3: Trigger Problems

Yes, this is about prototype 3 in learning code. I went back to redo the tutorial, but the trigger for the player avatar makes the player fall through. I tried looking for solutions and answers, but doc is super hard to interpret, and web pulls script issue help. I need physics, not script (I'm restricting my script, don't want to add unnecessary lines because of tutorial). Player has to have trigger. My player is falling through the ground, this is not meant to be.