1 - Introduction
2 - Welcome to the Series
3 - Internal Elements and Assigning Values
4 - Defining Series and Filtering Values
5 - Mathematical Functions and Evaluating Values
6 - NaN Values
7 - Dictionaries and Operations between Series
8 - DataFrame
9 - Selecting Elements
10 - Assigning Values
11 - Value Membership Deleting and Filtering
12 - Nested Dict and Transposition
13 - Methods and Duplicate Labels
14 - Reindexing
15 - Dropping
16 - Arithmetic and Data Alignment
17 - Arithmetic Methods
18 - DataFrame and Series and Operations
19 - Functions by Element and Row or Column and Statistics
20 - Ranking and Sorting
21 - Covariance and Correlation
22 - Assigning a NaN Value
23 - NaN Value Filtration
24 - Filling
25 - Hierarchical Indexing
