How would I make an idle animation? This is my first time scripting.

I did some research, and I believe you can use GetPropertyChangedSignal on the character, which can detect if a specified property of the character has changed, i.e velocity.

I saw someone else say this before but you could detect if the character's velocity is less than a number, and if it is, play the animation.

player.Character.Torso:GetPropertyChangedSignal('Velocity'):Connect(function()
    if player.Character.Torso.Velocity < 5 then 

        -- play animation

    end
end)

Saw this off a devforum. (I hope I'm still allowed to post it?)

Edit the Animate script. You can do that by starting up a play solo game in studio, then going to your character model and opening up the localscript Animate. Copy and paste that script into StarterCharacterScripts.

Inside the script, there is a table animNames. Inside the table, the first element is an element with the key idle. The value is a table of tables. Each table is a table that consists of the properties id, which has the value of the asset id for the animation, and then another property weight which you can read more about here.

All you have to do is add a table to the list consisting of your roblox asset id and weight and you will automatically perform the animation randomly when your player is idle.

local animNames = {
    idle = {
            { id = "http://www.roblox.com/asset/?id=507766666", weight = 1 },
            { id = "http://www.roblox.com/asset/?id=507766951", weight = 1 },
            { id = "http://www.roblox.com/asset/?id=507766388", weight = 9 },
            { id = "YOUR ASSET ID", weight = yourWeight }
        },
    walk =  {
        -- rest of script

Hope this helps! :)