If you're a beginner in unity you're probably having trouble getting an object to collide with a plane. The trick is to disable the mesh collider and use a box collider instead.
Posted from my blog with SteemPress : http://magicmonktutorials.com/blog/2018/11/17/unity-plane-not-colliding-fix/
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Eddie the Magic Monk has 14 years teaching experience as a high school teacher in Australia. He will explain things to you in the simplest way possible to help you fully understand high school mathematics and computer science concepts.