Computer Science Introduction

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Step by Step

Fireship How to Learn to Code - 8 Hard Truths


Frontend -

The frontend is the visible part of a website or application that users interact with directly, often called the β€œclient side.” It involves building web pages using HTML (structure), CSS (style), and JavaScript (interactivity). Modern frontend developers often use frameworks like React, Vue, or Angular to create complex, dynamic user interfaces efficiently.

SuperSimpleDev - Frontend web development - a complete overview

1. Start by creating a static website with HTML and CSS

Bro Code - HTML & CSS Full Course for Free 🌎

SuperSimpleDev - HTML & CSS Full Course: Beginner to Pro

2. Make your website dynamic with JavaScript

Bro Code - JavaScript Full Course for Free 🌐

SuperSimpleDev - JavaScript Full Course: Beginner to Pro

3. React, Vue, and Angular are some JavaScript frameworks to experiment with for the frontend

Fireship - I built the same app 10 times // Which JS Framework is best?

Syntax - Modern Vue.js Crash Course 2025 | with TypeScript + script setup + Composition API

Bro Code - React Full Course for Free βš›οΈ

SuperSimpleDev - React Full Course: Beginner to Pro (React 19, 2025)

4. Host your website online using a service like GitHub

SuperSimpleDev - How to put an HTML website online (on the Internet)

Now we have a website on the Internet. This was an easy way start learning and we something tangible to show for it. We could use these skills to create a blog, portfolio, landing page, game, or any other simple web application.


Backend -

The backend is responsible for handling data, logic, and communication with the database. This includes the Application Programming Interface (API) or middle layer which connects the frontend to the database and the database itself which stores the data.

SuperSimpleDev - Backend web development - a complete overview

1. Understand how the frontend talks to the backend via an API

Fireship - RESTful APIs in 100 Seconds // Build an API from Scratch with Node.js Express

freeCodeCamp.org - APIs for Beginners - How to use an API (Full Course / Tutorial)

2. Node.js lets you use JavaScript on the backend which has a simple framework Express.js for creating routes, requests, and database connections

Dave Gray - Node.js Full Course for Beginners | Complete All-in-One Tutorial | 7 Hours

3. MySQL, PostgreSQL, and MongoDB are the most common databases

Fireship - SQL Explained in 100 Seconds

MongoDB - MongoDB Explained in 10 Minutes | SQL vs NoSQL | Jumpstart

The Coding Gopher - 99% of Developers Don't Get PostgreSQL

4. Build a full stack application connecting frontend, backend, and database

freeCodeCamp.org - CRUD API Tutorial – Node, Express, MongoDB

5. Add authentication and authorization to allow users to register and log in securely

Microsoft Azure - Microsoft Entra ID Authentication Fundamentals

Web Dev Simplified - JWT Authentication Tutorial - Node.js

6. Deploy your full stack application on a platform like Render, Railway, or Vercel


DevOps and Deployment -

After building and deploying your full stack application, the next step is to understand how software runs reliably at scale. DevOps connects development with operations, emphasizing automation, consistency, and observability.

1. Version control and collaboration with Git and GitHub

Learn branching, pull requests, and conflict resolution to manage codebases effectively in teams.

2. Continuous Integration and Continuous Deployment (CI/CD)

Automate testing and deployments using pipeline tools so updates are consistent and reliable.

3. Containers and Virtualization

Use Docker to package applications and learn how containerization improves portability, scaling, and reproducibility.

4. Cloud platforms and hosting

Understand how web applications are deployed on cloud services such as AWS, Azure, or Google Cloud. Learn how virtual machines, storage, and networking integrate in the cloud.

5. Monitoring and logging

Track system performance and debug issues using tools for metrics, error logs, and uptime monitoring.


Computer Science Fundamentals -

A well-rounded developer should understand how computers, compilers, and operating systems actually work. This phase transitions from coding and tools to theory and systems β€” the invisible layers beneath your applications.

1. Computer Architecture and Organization

Learn how hardware executes software: binary, logic gates, the CPU, memory, instruction cycles, caching, and how assembly translates into machine code.

Experiment with low-level programming through C and assembly to understand how code interacts with memory and hardware.

2. Operating Systems and Concurrency

Understand how operating systems manage processes, threads, and resources. Learn about scheduling, memory allocation, synchronization, and inter-process communication.

Practice by writing small programs in C and Python that use threads, file I/O, and process management.

3. Compilers, Interpreters, and Programming Languages

Study how high-level code is parsed and translated into executable instructions. Learn the differences between compiled and interpreted languages, garbage collection, and runtime environments.

Build a simple interpreter or compiler for your own language to understand lexical analysis and parsing.

4. Data Structures and Algorithms

Deepen your algorithmic understanding β€” arrays, linked lists, stacks, queues, trees, graphs, hashing, sorting, recursion, and complexity analysis.

Implement core structures and algorithms in Python and C++ and study Big-O efficiency and trade-offs.

5. Networking and the Internet

Learn how data travels between systems. Study protocols like HTTP, TCP/IP, DNS, and TLS. Understand sockets and client-server communication.

Build small network programs or simulations to visualize data transfer and latency.

6. Databases and Data Management

Go beyond CRUD. Learn indexing, query optimization, transactions, consistency models, and distributed storage.

Compare relational (PostgreSQL, MySQL) and non-relational (MongoDB, Redis) systems and understand their internal workings.

7. Security and Cryptography

Understand fundamental security principles β€” encryption, hashing, digital signatures, authentication, and authorization.

Explore how HTTPS, JWT, and OAuth work and learn to identify and prevent common vulnerabilities like XSS and SQL injection.


Software Engineering and Architecture -

With a strong understanding of both practical development and computer systems, the next step is learning how to design and organize large, maintainable applications.

1. Software Design Principles

Study SOLID, DRY, KISS, and YAGNI principles for writing clean, maintainable code. Learn object-oriented and functional design patterns.

2. Architecture and Scalability

Explore layered architecture, microservices, modular monoliths, and event-driven systems. Understand trade-offs in scalability, coupling, and maintainability.

3. Testing and Reliability

Write unit, integration, and end-to-end tests. Learn about test-driven development (TDD), code coverage, and debugging strategies.

4. Versioning and Maintenance

Understand semantic versioning, documentation, refactoring, and long-term maintenance of codebases.


Systems and Advanced Topics -

Now you can dive deeper into advanced areas that bridge theoretical and applied computer science β€” where software meets performance, distribution, and scale.

1. Distributed Systems

Learn about system design at scale: consensus algorithms, replication, partitioning, and fault tolerance. Study CAP theorem and eventual consistency.

2. Concurrency and Parallelism

Explore synchronization primitives, shared-memory models, and message-passing systems. Understand how multithreading differs from multiprocessing.

3. Performance Optimization

Learn profiling, caching, memory optimization, and database tuning to improve system efficiency.

4. Theory of Computation

Study automata, formal languages, and Turing machines to understand the limits of computation and problem complexity.


Portfolio, Projects, and Continuous Learning -

By this point, you should have both applied and theoretical knowledge β€” the ability to design, implement, and understand systems from hardware to high-level applications.

1. Capstone and Research Projects

Build a large-scale, original project demonstrating full-stack development, system design, and software engineering principles.

2. Portfolio Development

Publish your work on GitHub, create a professional portfolio website, and document your learning journey.

3. Open Source and Collaboration

Contribute to open source projects and collaborate on team builds to simulate real-world development environments.

4. Continuous Exploration

Continue deepening your expertise β€” study compilers, operating system kernels, graphics, AI, cybersecurity, or networking depending on your interests.