I just have problem with walk animation how can i fix this?

So i have a few question to ask you guys.

First. When i walk the animation is work. Yeah it work. But when i stop...What the why animation is still play? What??? The animation is still play for 1 - 4 second so i really don't want that because is not going to be cool in my game can you guy fix this? :C

Second. (You guy can answer it or not whatever) This just not about walking animation i just want to ask about how do i can animation tool? Like swing knife when you idle or throwing knife up and grab it etc so i just want to know how to make it :D

have any tip to make animation cool? ( ?° ?? ?°)

repeat wat() until game.Players.LocalPlayer.Character:IsDescendantOf(workspace)

local Humanoid = game.Players.LocalPlayer.Character.Humanoid

Humanoid.Running:connect(function(speed)
    if speed > 0 then
        print('player is running')
	-- paste your WALKING animation here
    else
        print('player is idle')
	-- paste your IDLE animation here
    end
end)