freeCodeCamp.org
Summaries
How Ethical Hackers Actually Break Into Systems
Shell access is achieved only in an isolated, deliberately vulnerable CTF lab, using standard enumeration, credential guessing, and file-upload exploitation [7302].
Jev Course – Prefill-Only Inference & Decision Models from Scratch
Jev-style decision models replace autoregressive text generation with a single prefill pass that maps context, question, and option inputs to typed decision probabilities [158]....
MCP Security Fundamentals Course
OWASP MCP Top 10 controls are effective when they remove at least one leg of the lethal trifecta—private data, untrusted content, or external communication—because the cited inc...
PostgreSQL Hybrid Search Course – Keyword (BM25) + Vector Retrieval
One PostgreSQL database can hold article rows, a BM25 keyword index, and semantic vectors, letting , , RRF, and FastAPI run a transactional Wikipedia search stack [294]. The imp...
Design Software Systems Like a Senior Engineer – Complete Course
System design interviews are scored on five dimensions rather than a single correct architecture [540]. The practical process is five steps: clarify requirements, design data/AP...
n8n Full Course – Architect Scalable AI Automations from Scratch
n8n is an orchestration engine for event-driven AI workflow systems rather than a limited connector tool [66]. The course demonstrates implementation patterns with sample workfl...
TanStack Router Course – Loaders, Auth & Type-Safe Routes
TanStack Router infers paths, params, search params, loader return types, and route context from file conventions, allowing typed , , , , and guards [548]. The “industry standar...
Build & Train a GLM-5.3-Flash Model From Scratch with Python
A 25M-parameter CPU-trainable from-scratch GLM-5.3-Flash variant improves simple Python tasks from 0/24 to 16/24 pass@1 after GRPO [1968]. The actual takeaway is research-design...
Build your own Mobile App with Codex GPT-6 Astra - Full iOS and Android Course
A working Instagram-style Expo MVP is produced with Codex GPT-6 Astra through a structured workflow, ending after local app, development-build, legal-pages, and monitoring setup...
Python Algorithmic Trading Course – Massive, SnapTrade & Alpaca Integrations
The final deliverable is a local Django pipeline that ranks stocks by 12-1 momentum, connects SnapTrade to Alpaca paper trading, and executes simulated market orders [6177]. It ...
Inside SeaHack: 24 Hours to Build an AI Startup
SeaHack HK was a 24-hour, more-than-250-person AI hackathon in Hong Kong that selected one winner for each of three tracks, but the video is an event report, not evidence of rev...
TimescaleDB Course – PostgreSQL for Time-Series Data
TimescaleDB is a PostgreSQL extension whose main production value is automatic time partitioning plus incrementally refreshed aggregates and columnar compression, rather than a ...
OpenAI Codex Crash Course – Build & Deploy Apps with Autonomous AI
OpenAI Codex functions as an autonomous development agent within the desktop interface, managing programming workflows through automated task scheduling, external system connect...
Learn Python – Interactive Course 2016
Python syntax processes data through variable assignments, structured collections, conditional branches, loops, modular functions, and defensive error handling.
Inside the AI Hardware Engine – Full Semiconductor Supply Chain Course
The modern AI hardware industry is a fragile, highly interdependent supply chain defined by extreme specialization across six key phases: physics, design, fabrication, memory, p...
Excel Formulas & Functions – Full Course
This course provides a comprehensive framework for mastering Excel formulas and functions, moving from basic arithmetic to advanced data manipulation, with a focus on logical pr...
Meta Muse Code & Muse Spark Course – Build AI Agents, APIs, and Full-Stack Apps
Meta provides an integrated developer ecosystem utilizing Muse models and the Muse Code CLI, designed for autonomous application development, API orchestration, and structured d...
Stop Building AI Slop – Build High-End Web Apps with AI
Building high-quality web applications using AI involves extracting detailed project requirements, cloning proven UI architectures as a foundation, systematically restyling comp...
Learn Data Structures and Algorithms Visually – Crash Course
Data structures and algorithms are tools used to organize information and process it efficiently. The goal is to minimize the time and memory a computer needs to complete a task...
Code a Reinforcement Learning Library in C from Scratch (Full Course)
Building a functional reinforcement learning pipeline in C involves constructing a manual automatic differentiation engine, defining matrix mathematics, and developing a state-e...
System Design for AI Agents – Building a Multi-Agent PR Reviewer
An effective multi-agent code review system relies on mapping existing human workflows to identify mechanical tasks for automation while reserving senior engineer judgment for h...
Python for Engineers & Robotics – Master NumPy, Pandas, and ChatGPT Automation
Python is a versatile tool for mechanical engineers, enabling efficient automation, data analysis, and complex numerical simulations through libraries like NumPy and Pandas, wit...
Claude Code Full Course – Autonomous Goals, MCP, and VS Code Setup
Claude Code functions as a command-line interface that allows an AI model to operate within a local software development environment, managing file systems, executing tasks auto...
Low-Level Graphics in C – Pixel Manipulation and Frame Buffers
Creating low-level graphics in C on modern operating systems requires an abstraction layer to bypass memory access restrictions, allowing developers to manually write pixel data...