Answer 1

I think this is what you mean:
https://code.sololearn.com/c51Fi9kAX4F1/?ref=app

Answer 2

Change line 38 to students = [lloyd, alice, tyler]

Explaination.
You have inserted names as strings to the table. So in the for loop you are trying to access properties of a string, not the dictionary. Just removing the quotes will work

Answer 3

Try this bro: students = [lloyd, alice, tyler]
We call a variable without double quote!