Creating a new basic command

First we need know the paramters

if : Start an function, example : if someone says "Hi" then repond "hello"

then: final string to start the function, need be with "if" no matter what

Now lets start coding!

client:on('messageCreate', function(message) --creates a function that its maked when someone creates a message
    if message.content = "!hi" then --if the message is "!hi" then
       message.channel:send("hello!") --we send in channel hello
    end
end)

Simple isnt? Well its just the begin! We gonna learn how make an !clear command in another pages