Free courses can help you learn coding languages like Python and JavaScript, data analysis techniques, and web development fundamentals. You can build skills in problem-solving, algorithm design, and creating interactive websites. Many courses introduce tools such as Git for version control, SQL for database management, and various frameworks that streamline web development, allowing you to apply your skills in practical projects.

Skills you'll gain: Open Web Application Security Project (OWASP), Vulnerability Scanning, Proxy Servers, Security Testing, Penetration Testing, Vulnerability Assessments, Brute-force attacks, Test Tools, Web Scraping
★ 4.3 (290) · Intermediate · Guided Project · Less Than 2 Hours

Birla Institute of Technology & Science, Pilani
Skills you'll gain: Operating Systems, Operating System Administration, Memory Management, OS Process Management, System Software, System Programming, Command-Line Interface, Linux Administration, File Systems, System Monitoring, Performance Tuning, Package and Software Management, Systems Architecture, File Management, Algorithms, Cloud Platforms, User Accounts, Security Controls, Data Sharing
★ 4.9 (14) · Intermediate · Course · 1 - 3 Months

Skills you'll gain: Embedded Systems, Embedded Software, C (Programming Language), C and C++, Programming Principles, Memory Management, Hardware Architecture, Computational Logic, Computer Architecture, Computer Programming, Peripheral Devices
★ 4.5 (43) · Intermediate · Course · 1 - 4 Weeks

Peking University
Skills you'll gain: Memory Management, Data Structures, Algorithms, Computer Science, Program Development, Performance Tuning
★ 4.3 (106) · Mixed · Course · 1 - 3 Months

University of Colorado System
Skills you'll gain: Distributed Denial-Of-Service (DDoS) Attacks, Intrusion Detection and Prevention, Security Controls, Malware Protection, Information Systems Security, Network Security, Security Testing, Firewall, Digital Forensics, Anomaly Detection, Code Review, Network Routing, Proxy Servers, Linux, Internet Of Things
★ 4.5 (174) · Beginner · Course · 1 - 4 Weeks

Johns Hopkins University
Skills you'll gain: Image Analysis, Event-Driven Programming, Scalability, Dataflow, Digital Signal Processing, Distributed Computing, C++ (Programming Language), Program Development, Performance Tuning, Memory Management, Algorithms
★ 3.4 (29) · Intermediate · Course · 1 - 3 Months

Simplilearn
Skills you'll gain: Object Oriented Programming (OOP), C++ (Programming Language), Object Oriented Design, Memory Management, Computer Programming, Code Reusability, Programming Principles, Algorithms, Data Structures, Data Manipulation
★ 4.4 (59) · Beginner · Course · 1 - 4 Weeks

Nanjing University
Skills you'll gain: Operating Systems, File Systems, File Management, Computer Systems, Memory Management, System Software, OS Process Management, File I/O, Data Storage, Computer Hardware, Program Development, Peripheral Devices, System Design and Implementation, Algorithms
★ 4.5 (143) · Mixed · Course · 1 - 3 Months

University of Michigan
Skills you'll gain: Memory Management, C (Programming Language), C and C++, Data Structures, Secure Coding, Application Security, System Programming, Programming Principles
★ 4.5 (75) · Intermediate · Course · 1 - 4 Weeks
University of Colorado Boulder
Skills you'll gain: Google Ads, Online Advertising, Digital Advertising, Contextual Advertising, Paid media, Advertising, Advertising Campaigns, Media Buying, Media Planning, Digital Media Strategy, Earned Media, Target Audience, Content Strategy, Data-Driven Marketing, Data Ethics, Business Ethics
★ 4.6 (73) · Beginner · Course · 1 - 3 Months

DeepLearning.AI
Skills you'll gain: CrewAI, AI Workflows, AI Orchestration, Agentic Workflows, Generative AI Agents, Agentic systems, LLM Application, Automation, Artificial Intelligence and Machine Learning (AI/ML), Model Context Protocol, Context Engineering, Artificial Intelligence, System Monitoring, Workflow Management, Context Management, Tool Calling, Continuous Monitoring, Scalability, Memory Management, Large Language Modeling
★ 4.5 (12) · Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Prompt Engineering, LLM Application, OpenAI API, OpenAI, Hugging Face, Large Language Modeling, Agentic systems, Embeddings, AI Workflows, Data Processing, Vector Databases, Retrieval-Augmented Generation, Generative AI Agents, Application Development, Memory Management
★ 3.2 (21) · Intermediate · Course · 3 - 6 Months