Question❓ in UNITY 3D / 2D

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how can i program players can't go through the wall?
Hi, I'm 12 years old, earlier I was doing games on Construct 2. But now I started to learn C# and Unity. I'm doing game about boxes: https://youtu.be/NPLsmZGH2w8. Please, help me with code of destroying boxes.

BOXFALL | GAMEPLAY version: 1.01
YouTube
https://www.youtube.com/watch?v=NPLsmZGH2w8


I got an error and I'm not sure what caused it. Can anybody help me out?
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Algún desarollador de juegos de unity que me ayude a solucionar un problemilla? xd
Any unity game developer to help me solve a little problem? xd
Do really people want an another game about SCP, but in PSX style. Because I have idea for one.
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