How do you make an animation with just using a script only? Not with ROBLOX Plugin.

I don't want to use animations from ROBLOX Animation plugin. I want a way you can use on sb (Script Builder) with just scripts. Is there any way like this?

Using linear interpolation, you can make an animation smoothly, and more easily. You also have to use jointInstances to move the body parts

local Player = game.Players.LocalPlayer
local Character = Player.Character
local leftArm = Character.Torso['Left Shoulder'] -- there's also Neck(Head), Character.HumanoidRootPart(Torso), Right Shoulder(Right arm), Left Hip(Left leg), and right hip (right leg)

local Run = game:GetService('RunService')
local spd = .1 --how fast to get to the goal (1 being the fastest)

Run.RenderStepped:connect(function()
	leftArm.C0 = leftArm.C0:lerp(CFrame.new(x, y, z) * CFrame.Angles(math.rad(x), math.rad(y), math.rad(z)), spd)
end)

if you're looking for more smooth back and forth animation

Run.RenderStepped:connect(function()
	leftArm.C0 = leftArm.C0:lerp(CFrame.new(x, y, z) * CFrame.Angles(math.rad(x * math.sin(tick())), math.rad(y * math.sin(tick())), math.rad(z * math.sin(tick()))), spd)
end) -- can be math.cos if you'd like, and doesn't have to be on all axis's

and don't forget to remove roblox's default animations, to do this simply use the code below

Character.Humanoid:ClearAllChildren()
Character.Animate:Remove()