In this chapter, we will cover:
- Installing NLTK
 - Performing sentence splitting
 - Performing tokenization
 - Performing stemming
 - Performing lemmatization
 - Identifying and removing stop words
 - Calculating the frequency distribution of words
 - Identifying and removing rare words
 - Identifying and removing short words
 - Removing punctuation marks
 - Piecing together n-grams
 - Scraping a job listing from StackOverflow
 - Reading and cleaning the description in the job listCreating a word cloud from a StackOverflow job listing