Get points for completing an obby?

You'd need to know how to use the AwardPoints method.

You need to learn about points. Try the Points tutorial.

OR

Take this script

-- declare service
local PointsService = Game:GetService("PointsService")

-- Bind function to player added event
game.Players.PlayerAdded:connect(function(player)
    -- Get total number of points the game has available
    local pointsToAward = PointsService:GetAwardablePoints()
    -- Get total number of points this game has already awarded to the player
    local universeBalance = PointsService:GetGamePointBalance(player.userId)
    -- Check if the game has points to award and if the player hasn't gotten any points yet. 
    -- If both are true, then give the player a point.
    if ( pointsToAward > 0 and universeBalance == 0) then
        -- pcall here, as AwardPoints *will throw an error* if another server has awarded the
        -- points that were available between us checking how many were available and
        -- us actually awarding the points. There is currently no way to avoid this pcall,
        -- whenever you AwardPoints you should always wrap it in a pcall.
        pcall(function()
            PointsService:AwardPoints(player.userId, 1)
        end)
    end
end)

-- Bind function to when points are successfully awarded
PointsService.PointsAwarded:connect(function(userId, userBalanceinUni, userBalance)
    -- Show message indicating that a player has gotten points
    local message = Instance.new('Message', game.Workspace)
    message.Text = "Point awarded to " .. userId .. ". This player now has " .. userBalance .. " points total!"
    wait(5)
    message:Destroy()
end)

Then watch the whole tutorial.

You can't magically make it pop out from thin air if you don't know how to do it.

Best regards, Nathan.