- Relational Databases
    - Creating, Altering, Dropping Tables
        - Primary and Secondary Keys
        - Adding Relationships Between Two Tables using Foreign Key
        - UNIQUE, DEFAULT, NOT NULL constraints
    - Inserting, Updating, Deleting Rows in a Table
    - Fetching data with SELECT queries
        - Filtering and Sorting
        - Aggregations
        - Optimizations using *
    - Combining Data from Two Different Tables using JOINs
    - Design a Database Schema for a Real-World Use-Case
        - Every small thing needs to be captured.
        - When to create a new column vs a new table?
        - Handling Scale using Indexes
- Developing APIs + Writing Tests
    - CRUD operations on the database
        - Using ORMs like Sequelize for abstraction
        - Uploading Files
    - Handling errors
        - in input parameters
        - in processing data
    - Returning Status Codes
        - with error messages
    - API Naming Conventions
    - REST vs GraphQL APIs
    - Unit Testing
    - Integration Testing
    - e2e Testing
    - Refactor Ruthlessly towards Cleaner Code
- Access Management 
    - Basic HTTP Authentication
    - Authentication vs Authorization
    - OAuth 2.0
    - JSON Web Tokens
- Deployment Pipeline
    - Setting up a project at professional level for a team
    - Continuous Integration
        - Pre Commit Hooks
            - Linting
            - commitlint
        - Post Commit Hooks
            - Testing
    - Continuous Delivery
        - Approval Workflows
            - Manual Approval
            - Rollback Option?
        - Continuous Deployment
    - Staging/QA Environments
- Handling Scale
    - Logging
    - Calculating Storage Required for 1000s of requests
    - Caching
    - Code Maintainability
    - Automations in MySQL using Triggers
    - API Versioning
    - Visual Testing
    - Distributed Servers