How can i use local script and it use for?

so i am new scripter and i need help for my script :D

A LocalScript is a Lua source container that runs Lua code on a client connected to a Roblox server. They are used to access client-only objects, such as the player's Camera. For code run through LocalScripts, the LocalPlayer property of the Players service will return the player whose client is running the script.

A LocalScript will only run Lua code if it is a descendant of one of the following objects: A Player's Backpack, such as a child of a Tool A Player's Character model A Player's PlayerGui A Player's PlayerScripts The ReplicatedFirst service

Read more:

Local Script API class Ref

Tutorial