docs(readme): update main repo readme with new sections

Author: jslvtr

README.md

@@ -52,38 +52,38 @@ The code is in files numbered between 1 and 11, covering concepts ranging from b
 
 ## Section 3: Your first REST API
 
-The code in this section includes a simple Flask app and a HTML and JavaScript file which calls the Flask app endpoints.
+The code in this section includes a simple Flask app that accepts and returns JSON data.
 
-## Section 4: Flask-RESTful
+## Section 4: Docker
 
-The code in this section includes a Flask app which is an API that represents items. It also includes user registration and authentication.
+Introduction to Docker to run your REST APIs. We talk about images, containers, and how to run applications.
 
-We also introduce Flask-RESTful, which is a Flask extension that helps us develop APIs more easily.
+## Section 5: Flask-Smorest
 
-## Section 5: Working with SQL
-
-The code in this section extends the last section by adding persistent storage of Items to a SQLite database.
+We introduce the Flask-Smorest extension, a library that greatly simplifies writing REST APIs using Flask. It also provides things like automated documentation generation.
 
 ## Section 6: Flask-SQLAlchemy
 
-The code in this section extends the previous section by replacing the manual integration with SQLite, with SQLAlchemy—an ORM (Object-Relational Mapping)—which allows us to easily replace SQLite with something like PostgreSQL or MySQL.
+The code in this section extends the previous section by replacing the data storage in Python lists with SQLAlchemy, an ORM (Object-Relational Mapping which simplifies connecting to and interacting with a database.
+
+## Section 7: Many-to-many relationships
 
-## Section 7: Git for version control
+In this section we talk about many-to-many relationships using SQLAlchemy.
 
-In this section we introduce Git, a tool for code sharing and collaboration. In this course we'll use it to store the application code and then send it to our deployment tools, Heroku and DigitalOcean.
+## Section 8: Authentication with Flask-JWT-Extended
 
-## Section 8: Deploying Flask Apps to Heroku
+Learn how to perform user authentication using JWTs and the Flask-JWT-Extended library. Here we talk about access token JWTs, as well as refresh tokens, JWT claims, blocklists, password hashing, and more.
 
-Learn how to use GitHub and Heroku to deploy your Flask applications and make them available publicly to your users.
+## Section 9: Flask-Migrate
 
-## Section 9: Deploying Flask Apps to our own servers
+After deploying your apps, making changes to the database can be really tricky because you have to log in to the database server and manually update the database tables using SQL commands.
 
-Learn how to rent a server using DigitalOcean and run our Flask app in it. This is an alternative to Heroku. It's much cheaper, but requires a lot more work to get it set up.
+Flask-Migrate and the Alembic libraries simplify this job by creating migration scripts.
 
-## Section 10: Security in your REST APIs
+## Section 10: Git Crash Course
 
-In this section we learn about https and how to enable it in your own server running with DigitalOcean.
+A quick and intense course on Git and GitHub for code sharing.
 
-## Section 11: Token Refreshing and Flask-JWT-Extended
+## Section 11: Deploying to Render.com
 
-Learn about token freshness and how to implement refresh tokens using Flask-JWT-Extended.
+Learn how to get your code running in the cloud and make it publicly accessible. In this section we use Render.com for deployments and we also deploy a PostgreSQL database.