Why don't we need the action and method attributes anymore?

Why is it that from exercise 5 onwards the form-tag in the explanation screen on the left no longer has the attributes action="/example.html" and method=“POST”>?

I must be very late to answer, but I think it might still help.
I think they have not included the mentioned attributes because they just wanted to tell us the meaning and use of those attributes in the beginning. Since in these programs, we are not actually sending any values, but we are just learning how to use the different elements in forms, those attributes are actually not needed.
Hope this helps,