beginner sctipter

Hey guys, I'm a beginner to scripting. I just know how to kill ppl with killbricks/game. Wrokspace and some other. Iff there's anyone out there who couldhelp me, it would be appreciated

also i don't get this local leaderstats = Instance.new("Folder", player)

leaderstats.Name = "leaderstats"

local stage = Instance.new("IntValue", leaderstats)

stage.Name = "Stage"

stage.Value = StageData:GetAsync(player.UserId) or 1

-- Retrieve the player's data, but if there is none, start the player on stage 1

player.CharacterAdded:Connect(function(character)

\-- The function we're connecting to this event will be called everytime the player's character spawns

GoToCheckpoint(character, stage.Value)

end)