"a script that makes the user dash forward, the script has a section for me to customize the animation ID and tell me where the script goes"

-- local script (place in StarterPlayerScripts) 
local Players = game:GetService("Players")
local player = Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")
local animationId = "INSERT_ANIMATION_ID_HERE" -- customize the animation ID

local animation = Instance.new("Animation")
animation.AnimationId = "rbxassetid://" .. animationId
local animationTrack = humanoid:LoadAnimation(animation)

local function dash()
    animationTrack:Play()
    local dashDirection = character.HumanoidRootPart.CFrame.LookVector * 50
    character.HumanoidRootPart.Velocity = Vector3.new(dashDirection.X, character.HumanoidRootPart.Velocity.Y, dashDirection.Z)
    wait(0.1)
    character.HumanoidRootPart.Velocity = Vector3.new(0, character.HumanoidRootPart.Velocity.Y, 0)
end

game:GetService("UserInputService").InputBegan:Connect(function(input, gameProcessedEvent)
    if input.KeyCode == Enum.KeyCode.X and not gameProcessedEvent then
        dash()
    end
end)

-- Replace "INSERT_ANIMATION_ID_HERE" with the animation ID you want to use. Place this script in StarterPlayerScripts.