Naming variables well

Variables can hold anything — but their names have rules. Learn the rules once and you'll never fight the editor about them again.

#The hard rules

A variable name can't have a space, can't start with a number, and can't be a reserved word like if or end.

So player coins is illegal, 2fast is illegal, and if is illegal. Everything else — playerCoins, PlayerCoins, player_coins — works.

local playerCoins = 0  -- good
local player_coins = 0 -- works
local PlayerCoins = 0  -- works, but usually means something else

#The style Roblox uses: camelCase

Roblox code uses camelCase: a lowercase first letter, then a capital for each new word. playerCoins, not PlayerCoins or player_coins.

Why? Because in Luau, a capital first letter usually means something special (you'll meet modules and types later). Sticking to camelCase keeps your code looking like everyone else's — which makes it easy to read and to share.

#The real rule: name it what it is

The difference between local x = 0 and local enemiesDefeated = 0 is not style. It's whether you can read this script a month from now.

Ask yourself: if someone reads the name out loud, does it say what's inside the box? coins holds a number of coins. hit holds the thing that got hit. part holds a part. A variable named enemy that holds the player's health will confuse you forever — name it what it is.

-- your variable here