turtle.digdown() and turtle.turnleft() doesn't work

Hello,
turtle.digdown() doesn't work! When i do turtle.dig() then he breaks the Block in front of him, but when i use turtle.digdown() then i won't work, what's wrong? :o/>/>

You have some miscapitalization:

turtle.digdown() -- turtle.digdown does not exist; the correct capitalization is:
turtle.digDown()

see help turtle.

Remember that most languages are case-sensitive;

>> x = 5
>> X = 20
>> print(x)
5
>> print(X)
20