This cannot be repeated often enough. Here is the seminal talk I'd recommend most people watch: https://www.youtube.com/watch?v=d-7o9xYp7eE

A law professor explaining why you should never say anything to the police: https://youtu.be/d-7o9xYp7eE

Sibling comments have the canonical video, but there's also this short one: https://www.youtube.com/watch?v=T_0i6EzWLT8