"npc that follows closest player walk animation and tell me where script goes"

Here's a script for an NPC that follows the closest player using walk animation. This script should be placed in a Server Script under the NPC model.

```lua
local NPC = script.Parent
local humanoid = NPC.Humanoid
local walkAnim = Instance.new("Animation")
walkAnim.AnimationId = "rbxassetid://YourAnimationIDHere" -- Replace with your walk animation ID
local walkTrack = humanoid:LoadAnimation(walkAnim)

local PathfindingService = game:GetService("PathfindingService")
local Players = game:GetService("Players")

local function findClosestPlayer()
    local closestPlayer = nil
    local closestDistance = math.huge

for _, player in ipairs(Players:GetPlayers()) do
        local character = player.Character
        if character then
            local distance = (character.HumanoidRootPart.Position - NPC.HumanoidRootPart.Position).magnitude
            if distance < closestDistance then
                closestDistance = distance
                closestPlayer = player
            end
        end
    end

return closestPlayer
end

while true do
    local closestPlayer = findClosestPlayer()

if closestPlayer then
        local character = closestPlayer.Character
        if character then
            local path = PathfindingService:CreatePath()
            path:ComputeAsync(NPC.HumanoidRootPart.Position, character.HumanoidRootPart.Position)

local waypoints = path:GetWaypoints()
            for _, waypoint in ipairs(waypoints) do
                humanoid:MoveTo(waypoint.Position)
                walkTrack:Play()
                humanoid.MoveToFinished:Wait()
            end
        end
    end

wait(1)
end
```

Make sure to replace "YourAnimationIDHere" with the actual ID of your walk animation.