Demostration

Now that we went through all you need to learn, Lets create our first command as example.

Client Side

local players = game:GetService("Players")
local replicated_storage = game:GetService("ReplicatedStorage")

local client = players.LocalPlayer

local storage = replicated_storage:WaitForChild("EXE6_STORAGE")
local events = storage.events

local CustomCommands = require(storage.modules.CustomCommands)

local TimeCC = CustomCommands:RegisterCommand("Time")
TimeCC.Description = "Change in-game time."
TimeCC.Icon = "rbxassetid://11963371162"
TimeCC.Event = storage.utilities.custom_commands.ChangeTime

TimeCC:AddParameter("Boolean", {
	Name = "Animate"
})

TimeCC:AddParameter("Slider", {
	Name = "Time",
	SliderRange = NumberRange.new(1, 24),
	SliderDefault = game.Lighting.ClockTime,
	SliderIncrement = .01,
})

Server Side

local tween_service = game:GetService("TweenService")
local replicated_storage = game:GetService("ReplicatedStorage")

local smooth = TweenInfo.new(10, Enum.EasingStyle.Exponential)

local storage = replicated_storage:WaitForChild("EXE6_STORAGE")

storage.utilities.custom_commands.ChangeTime.OnServerEvent:Connect(function(moderator, data)
	if data.Animate then
		tween_service:Create(game.Lighting, smooth, {ClockTime = data["Time"]}):Play()
	else
		game.Lighting.ClockTime = data["Time"]
	end
end)

Congrats! You have now officially learned everything about Custom Commands.