What's the difference between the script and local script?

[WaterJamesPlough (Neil)]

I believe this thread can be useful to you too:

Scripts vs Local Scripts

I’m a very new scripter, and I created a simple script that created a part and positioned it to the players torso when you pressed the key E, and I was so confused as to why it wasn’t working. So I created a local script and pasted it in there and it worked which confused me even more. How am I supposed to know if a certain code I’m looking to make will require a Local Script vs a regular Script, or vice versa?