dictionary2 = {'Key1': {'Key2': 'HSR'}, 'Key2':{'Key2' : 'HsR'},'Key3':'HSr'}

Question

Grab 'HSR' using keys and indexing.

Answer 1

dictionary2['Key1']['Key2']

Answer 2

The 1st one will be Key1

Answer 3

Sometimes it is faster to try than to ask (try this code on the playground):

dictionary2 = {'Key1': {'Key2': 'HSR'}, 'Key2':{'Key2' : 'HsR'},'Key3':'HSr'}
print(dictionary2['Key1']['Key2'])