Hello please help me

Data Analysis with Python: Zero to Pandas Lecture 6 - Exploratory Data Analysis
#1

Tell me please what to do

IMG_20210808_215515
IMG_20210808_2155151080×1444 237 KB

#2

Try:
df.Undergraduate Population.isnull().sum()

The above may not work due to the space in the feature name.

Try:
df[‘Undergraduate Population’].isnull().sum()