These are books that I purchased and have enjoyed very much. If they are here then I learned a great deal for them, and feel they are not only worthy of a purchase, but that they are best in class. Each subsection is listed in order of my favorite to least favorite when compared to each other.

# python

**beginner**

**intermediate/advanced**

# SQL

# data science

**beginner**

**intermediate/advanced**

# algorithms

# mathematics

###### calculus

###### precalculus

###### differential equations

- Ordinary Differential Equations
- Differential Equations
- Solution Techniques for Elementary Partial Differential Equations
- Differential Equations, Dynamical Systems, and an Introduction to Chaos