Traying to make my Q key Dash Me up In the air but ,its just Teleporting me instead?

The reason your code is simply teleporting you is because you are setting the HumanoidRootPart's CFrame rather than transitioning the CFrame/position.

While you may be able to accomplish the desired result using tweens, I would not recommend it. The method I would recommend is using BodyPositions and BodyGyros.

This is the way I accomplished a 'dash' effect:

--=== Services ===--

local UIS = game:GetService("UserInputService")
local RunService = game:GetService("RunService")

--=== Variables ===--

local speed = 20 -- studs per second
local total_add = 30 -- height increase in pixels per dash
local dampener = 3 -- dampener to directional travel (non-vertical travel, x and z)

local direction = nil -- defined later in the script

local bPos -- defined later
local bGyro -- defined later
local count = 0 -- used later in the script to determine how high the player has travelled

local dashDebounce = false -- ready to accept input to dash
local Player = game.Players.LocalPlayer

local char = Player.Character
repeat
    char = Player.Character
    wait()
until char ~= nil
local HRP = char:WaitForChild("HumanoidRootPart")
local humanoid = char.Humanoid

--=== Functions ===--

local function Setup()
    HRP = char:WaitForChild("HumanoidRootPart")
    direction = Vector3.new(humanoid.MoveDirection.X * speed / dampener, 0, humanoid.MoveDirection.Z * speed / dampener)
    bPos = Instance.new("BodyPosition")
    bPos.Position = HRP.Position
    bPos.Parent = HRP
    bGyro = Instance.new("BodyGyro")
    bGyro.CFrame = HRP.CFrame
    bGyro.MaxTorque = Vector3.new(math.huge,math.huge,math.huge)
    bGyro.Parent = HRP
    humanoid.PlatformStand = true
end

local function Stop()
    bPos:Destroy()
    bGyro:Destroy()
    humanoid.PlatformStand = false
end

--=== Hooks / Main loop ===--

UIS.InputBegan:Connect(function(input,gpe)
    if not gpe and not dashDebounce then -- gpe = game processed event
        if input.KeyCode == Enum.KeyCode.Q then
            Setup()
            count = 0 -- reset the vertical distance travelled variable
            dashDebounce = true -- dashing...
        end
    end
end)

humanoid.StateChanged:Connect(function(old,new)
    if new == Enum.HumanoidStateType.Landed then
        dashDebounce = false -- ready to accept input to dash again
    end
end)

while wait(0.1) do
    if dashDebounce then
        if count < total_add then
            local increment = speed / 10
            if count + increment > total_add then
                -- End on the exact total_add amount
                increment = (count + increment) - total_add 
            end

            bPos.Position += Vector3.new(direction.X,increment,direction.Z)
            count += speed / 10
            bGyro.CFrame = CFrame.new(HRP.Position,Vector3.new(direction.X + HRP.Position.X,HRP.Position.Y,direction.Z + HRP.Position.Z))
        else
            Stop() -- Stop the dash
        end
    end
end

My general explanation of the code is this:

The player's vertical climb is speed studs per second.

The player's directional movement is equal to 1 / dampener * speed studs per second.

These variables can be altered to change the way the dash looks:

local speed = 20 -- studs per second
local total_add = 30 -- height increase in pixels per dash
local dampener = 3 -- dampener to directional travel (non-vertical travel, x and z)

If you want the player to move directly up with no directional movement, change

Pos.Position += Vector3.new(direction.X,increment,direction.Z)
count += speed / 10
bGyro.CFrame = CFrame.new(HRP.Position,Vector3.new(direction.X + HRP.Position.X,HRP.Position.Y,direction.Z + HRP.Position.Z))

to

Pos.Position += Vector3.new(0,increment,0)
count += speed / 10
bGyro.CFrame = HRP.CFrame

I would also highly recommend using an animation, because as it stands right now, the player looks stiff as a board (as a result of Humanoid.PlatformStand)

This may be confusing, and I completely get that. If you would like something explained in more detail, feel free to contact me on Discord (phxntxsmic#2021)