How can I make it read data? It sends no errors back

to see where something isn't working to, use the code below.

print(1)

Up the number on each line you do. Here's what I'd suggest doing.

local Players = game:GetService("Players")
local DataStoreService = game:GetService("DataStoreService") -- Getting data store service

Players.PlayerAdded:connect(function(player)
    local TrackersData = DataStoreService:GetDataStore(player.UserId.."Trackers") -- Getting data store 
print(1)
    local LevelTracker = Instance.new("Folder")
print(2)
    LevelTracker.Parent = player
print(3)
    LevelTracker.Name = "LevelTracker"
print(4)
    local Level1 = Instance.new("BoolValue")
print(5)
    Level1.Parent = LevelTracker
print(6)
    Level1.Name = "Level1"
print(7)
    Level1.Value = false
print(8)
    local Value = TrackersData:GetAsync("Level1") -- Getting value from data store "TrackersData"
print(9)
    if Value == nil then
print(10)
       TrackersData:SetAsync("Level1",false) -- if value equals nothing then it'll creates it.
print(11)
    else
       Level1.Value = Value
print(12)
    end
end)

Which ever print doesn't print out in output, will be the line that's screwing up.