Best of freeCodeCamp — March 2025

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   Article

   freeCodeCamp·1y

   Learn Software Design Basics: Key Phases and Best Practices

   Good software design is essential to avoid inefficiencies and bottlenecks. It involves creating scalable, maintainable, and easy-to-debug systems. Key elements include defining the problem statement, identifying use cases, stating requirements, designing the architecture, and drafting a detailed design. Assumptions and thorough documentation are crucial for clarity and long-term success. A practical example of designing a financial expense categorization system illustrates these principles.

   558

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2. 2
   Article

   freeCodeCamp·1y

   Why Your Code is Slow: Common Performance Mistakes Beginners Make

   Slow code is a common issue for beginners. This guide explores seven frequent performance pitfalls and offers solutions to enhance code efficiency. Key topics include logging, loop optimization, database query handling, understanding hardware, memory management, array traversal, and avoiding unnecessary data copies. Practical examples and tips help developers write faster, more efficient code, and understand the importance of profiling and choosing appropriate data structures.

   513

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3. 3
   Article

   freeCodeCamp·1y

   Learn API Fundamentals and Architecture – A Beginner-Friendly Guide

   APIs (Application Programming Interfaces) are essential tools that enable communication between different software systems. This guide covers the fundamentals of APIs, including their types (Open, Partner, Internal, Composite) and various architectures (REST, SOAP, GraphQL, gRPC). APIs streamline development by facilitating data exchange and integrating external functionalities securely and efficiently. Understanding these concepts helps developers choose the right API architecture based on performance, scalability, ease of use, and security needs.

   458

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4. 4
   Article

   freeCodeCamp·1y

   How to Write Effective Prompts for AI Agents using Langbase

   Learn how to write effective prompts for AI agents using Langbase. The post covers essential techniques such as defining clear goals, experimenting with prompts, using specific instructions, and applying advanced methods like few-shot training, memory-augmented prompting, and role-based prompting. Practical tips and a step-by-step guide for using Langbase to build serverless AI agents are also included.

   239

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5. 5
   Article

   freeCodeCamp·1y

   How to Build a Social Learning Platform using Next.js, Stream, and Supabase

   Learn how to build a social learning platform connecting students with professionals using Next.js, Stream SDKs for video calls and chat, and Supabase for backend services. The platform allows students to view posts, follow instructors, and join video sessions, while instructors can schedule meetings, share posts, and create community channels. This comprehensive guide covers setting up authentication, creating user roles, adding video conferencing, and integrating group chat functionalities.

   219

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   Article

   freeCodeCamp·1y

   Build a Full Stack AI Note Taking App with Next.js and Supabase

   Learn how to build a full-stack AI note-taking app using Next.js 15, Supabase, Prisma ORM, and OpenAI API through a step-by-step course by freeCodeCamp. This guide covers everything from project setup and database integration to adding AI-powered interactions and deploying on Vercel.

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7. 7
   Article

   freeCodeCamp·1y

   How to Create a Send Email Function using Nodemailer and OAuth2

   Learn how to implement a Send Email function in your web application using Nodemailer with OAuth2 for authentication. The guide covers setting up your development environment with Node.js, React, and Chakra UI, and then walks you through both frontend and backend setup. The process includes installing the required libraries, setting up a contact form, handling form submission and validation, and configuring OAuth2 authentication in Google Cloud to secure email sending via an SMTP service.

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8. 8
   Article

   freeCodeCamp·1y

   How to Connect Your AWS EC2 Instance to VS Code

   Learn how to create and connect an AWS EC2 instance to VS Code, including setting up SSH for secure access and installing necessary tools like Java and Maven for web development.

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9. 9
   Article

   freeCodeCamp·1y

   How to Build a MERN Stack To-Do App

   This guide explains how to build a full-stack MERN To-Do application from scratch. It provides step-by-step instructions on setting up the environment, creating a React frontend with Vite and TypeScript, and implementing CRUD operations using Axios. The backend is set up with Express.js and connected to MongoDB Atlas. The guide concludes with instructions for running the application and customizing the styling.

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