Can anyone help me with the Python code?

First, you have ifs [0] and [1] instead of [i] and [i+1] used, that is already wrong.

Second, you need Member State and not ). Otherwise, i+1 is an invalid index.

Thirdly, this only brings the greatest number to the right end.
Imagine the 6 would be left. Now go through the code piece by piece:
You are comparing the first number with the second one and if the first one is larger. The 6 is now second. Now you compare the second place with the third and exchange it. 6 is only in the third place. etc. You just take the largest number to the right.

To sort the complete list with this procedure, you need another loop to repeat the whole thing:

Feld = [5,4,3,4,5,6]

for _ in range(6):
    for i in range(5):
      if Feld[i]>Feld[i+1]:
        h = Feld[i]
        Feld[i] = Feld[i+1]
        Feld[i+1] = h

print(Feld)