I feel super dumb, but can anyone help with this? I’m using pandas.

I feel super dumb, but can anyone help with this? I’m using pandas. I have one empty dataframe with 12 columns. I have one dataframe with 30k rows that has 8 columns. Those 8 columns are in the first dataframe. I want to insert the data from the second dataframe into the first, with empty values for the 4 columns that don’t exist in the second dataframe but do in the first. What operation would I use on the dataframe?