Brand new user, trouble saving and reading excel

Hi, I’m learning Python and am now looking at JN for the first time and am having a few issues.

For some reason it wont save anymore, I cant edit the file name either- error says failed to fetch. Also when I try to read an excel file like this:

df3=pandas.read_excel(“supermarkets.xlsx”, sheet_name=0)
df3

it does nothing but will open a .csv file. I thought importing xlrd and openpyxl was what was missing but it still doesnt work. I am really new to programming and any help would be great, thanks!