What is CFrame and how would I use it in my games?

CFrame is very simply a database containing both position and orientation. There are loads of uses for CFrame such as creating beams from raycasting, rotating parts, and even teleporting players. I'll show you some examples below. (Note: I will be putting the things in --comments.) for moving parts alone, I just recommend you use Vector3.

Rotating the part's orientation

local part = workspace.Part

part.CFrame = CFrame.Angles(0,math.rad(90),0) --This changes the angle of the part, however, it resets the position to 0,0,0. So you need to do something like this:

part.CFrame = part.CFrame * CFrame.Angles(0,math.rad(90),0) --using the * is like adding.

Teleporting the player to another part (Not to be confused with TeleportService)

local part = workspace.Part

for i, v in pairs(game.Players:GetPlayers()) do --This gets the players.
	local character = v.Character
	character.HumanoidRootPart = part.CFrame --This teleports the player to the part, however, make sure collision is off and the part is transparent. If you use typical Vector3, it would instantly kill the player.
end