How do you make text on a Surface/ScreenGUI animate so it looks like it is typing itself out?

There are a few ways, you can do it from nothing and keep changing the text, but that's lots of work, or you could use some string stuff and loops :)

You would need to use string.len and string.sub like you can see in the example below

local sentence = 'I like programming with roblox studio :)' -- The thing you want it to type out
local label = script.Parent -- Your textlabel

local len = string.len(sentence) -- It gets the lenght of your string


repeat -- Isn't neccesary, it just makes it so it loops
    wait() -- pretty neccesary if you don't want your studio to crash xD
    n = 0 -- Sets n (position) to 0
    repeat -- Loop is neccesary if you don't want it to do manually
        wait(0.2) -- Waittime
        n = n + 1 -- Add to position with 1
        label.Text = string.sub(sentence,1,n) -- Sets the text using string.sub
    until n >= len -- Waits for the lenght to be the same as the position
until false

You could also add a sound if you want, a good one is https://www.roblox.com/library/172065335/typewriter-key-1

Edit for mouseclick :)