[SOLVED] Make the player only jump once, even if the spacebar is held down?

I want to (the question), I searched all over for something like this, just found how to make a double jump script, completely contrasting my question.

Here's my script

local UserInputService = game:GetService("UserInputService")

local LshiftKey = Enum.KeyCode.LeftShift
local SpaceKey = Enum.KeyCode.Space

local function IsShiftKeyDown()
	return UserInputService:IsKeyDown(LshiftKey)
end

local function SpaceKeyDown()
	return UserInputService:IsKeyDown(SpaceKey)
end

local function KeyPressed(input)
	if IsShiftKeyDown() then
		script.Parent.Humanoid.WalkSpeed = 32
	else
		script.Parent.Humanoid.WalkSpeed = 16
	end
	if SpaceKeyDown() then
		wait(0.005)
		script.Parent.Humanoid.WalkSpeed = 32
		wait(0.2)
		script.Parent.Humanoid.WalkSpeed = 16
	end
end

UserInputService.InputBegan:Connect(KeyPressed)
UserInputService.InputEnded:Connect(KeyPressed)

At lines 20 to 25, it fires first time when the player jumps (with the spacebar held), then after > 1 jumps, it fires randomly.

( Important Note: This script is very basic as my scripting knowledge isn't that high (which is probably a problem considering the question). I'll try to understand if I get any complex answers and probably ask dumb questions regarding it. Really hope I was as constructive as possible to my current question. )

BIG THANKS to PrismaticFruits for the sample script, which helped me frame my answer

I implemented some parts of Prismatic's Sample script, and it worked! Here's the final answer.

local db = 0
local UserInputService = game:GetService("UserInputService")

local LshiftKey = Enum.KeyCode.LeftShift
local SpaceKey = Enum.KeyCode.Space

local function IsShiftKeyDown()
	return UserInputService:IsKeyDown(LshiftKey)
end

local function SpaceKeyDown()
	return UserInputService:IsKeyDown(SpaceKey)
end

local function KeyPressed(input, gameProcessedEvent)
	if IsShiftKeyDown() then
		script.Parent.Humanoid.WalkSpeed = 32
	else
		script.Parent.Humanoid.WalkSpeed = 16
	end
	if SpaceKeyDown() then
		if db == 0 then
		wait(0.005)
		script.Parent.Humanoid.WalkSpeed = 32
		wait(0.2)
		script.Parent.Humanoid.WalkSpeed = 16
		script.Parent.Humanoid.JumpPower = 0
		db = 1
		UserInputService.InputEnded:Wait()
		if not SpaceKeyDown() then
		db = 0
		script.Parent.Humanoid.JumpPower = 50	
		end
		end
	end
end

local function changejump(input)
	if not SpaceKeyDown() then
		db = 0
		script.Parent.Humanoid.JumpPower = 50
	end
end

UserInputService.InputBegan:Connect(KeyPressed)
UserInputService.InputEnded:Connect(KeyPressed)
UserInputService.InputEnded:Connect(changejump)