What do i need to add or take away to make this script able to end?

local tool = script.Parent
local katana = tool.Katana
local db = false 
local backpack = tool.Parent
local player = backpack.Parent
local playerStats = player:FindFirstChild("leaderstats")
local playerSliced = playerStats:FindFirstChild("In Backpack")
local playerSpaces = playerStats:FindFirstChild("Space Available")
 
local function onTouch(partTouched)
	local canHarvest = partTouched.Parent:FindFirstChild("CanHarvest")
	if canHarvest then
		if canHarvest.Value == true and playerSliced.Value < playerSpaces.Value then
			playerSliced.Value = playerSliced.Value + 1
			canHarvest.Value = false
			partTouched.Transparency = 1 
			partTouched.CanCollide = false
			wait(5)
			canHarvest.Value = true
			partTouched.Transparency = 0 
			partTouched.CanCollide = true
local function onTouch(partTouched)
	if canHarvest then
	if canHarvest.Value == true and playerSliced.Value >= playerSpaces.Value then
 				script.Parent.Handle.Touched:connect(function(Hit)
	
				local player = game.Players:GetPlayerFromCharacter(Hit.Parent)
	    		player.PlayerGui.NES.Frame.Visible = true
	    		
				wait(2)
				
				player.PlayerGui.NES.Frame.Visible = false

i Dont know why it keeps giving me errors about the script.Parent.Handle.Touched:connect(function(Hit) it says it needs to end but ive tried everything heres the code so far!

I don't know what happened in the process of making your script, but you appear to be missing every end the script needs to have. Normally after typing an if then statement, the Roblox editor gives an end to make typing quicker even though you shouldn't rely on the editor. This should be the script you need:

local tool = script.Parent
local katana = tool.Katana
local db = false 
local backpack = tool.Parent
local player = backpack.Parent
local playerStats = player:FindFirstChild("leaderstats")
local playerSliced = playerStats:FindFirstChild("In Backpack")
local playerSpaces = playerStats:FindFirstChild("Space Available")

local function onTouch(partTouched)
	local canHarvest = partTouched.Parent:FindFirstChild("CanHarvest")
	if canHarvest then
        	if canHarvest.Value == true and playerSliced.Value < playerSpaces.Value then
	            playerSliced.Value = playerSliced.Value + 1
	            canHarvest.Value = false
	            partTouched.Transparency = 1 
	            partTouched.CanCollide = false
	            wait(5)
	            canHarvest.Value = true
	            partTouched.Transparency = 0 
	            partTouched.CanCollide = true
		end
	end
end
local function onTouch(partTouched)
    if canHarvest then
   	 if canHarvest.Value == true and playerSliced.Value >= playerSpaces.Value then
                script.Parent.Handle.Touched:Connect(function(Hit)
	              	  local player = game.Players:GetPlayerFromCharacter(Hit.Parent)
	              	  player.PlayerGui.NES.Frame.Visible = true
	
	             	   wait(2)
	
	             	   player.PlayerGui.NES.Frame.Visible = false
			end) -- This part needs a parenthesis at the "end" to close the parenthesis past :Connect(
		end
	end
end

This may fix your end issue (I did not test, just put ends where I saw they should be), but you may have a few code errors and issues with how you are handling your task. If this is so, feel free to post another question after **trying **to fix your issue.