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.

28DIGITAL
Skills you'll gain: File I/O, Data Structures, Theoretical Computer Science, Algorithms, Memory Management, Graph Theory, Data Access, Performance Tuning
★ 4.6 (60) · Advanced · Course · 1 - 3 Months

Skills you'll gain: OSI Models, Network Security, Security Controls, General Networking, Wireless Networks, Network Protocols, Firewall, Network Administration, TCP/IP, Telecommunications, Proxy Servers, Distributed Denial-Of-Service (DDoS) Attacks, Network Infrastructure, System Configuration, Network Architecture, Intrusion Detection and Prevention, Hardening, Remote Access Systems, Authentications
★ 4.6 (41) · Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Remote Access Systems, TCP/IP, System Programming, Network Protocols, Performance Tuning, Program Development, Memory Management, Hardware Architecture, Computer Hardware
★ 4.6 (53) · Intermediate · Course · 1 - 3 Months

Edureka
Skills you'll gain: Cloud-Native Computing, Memory Management, Grafana, Web Applications, Program Development, Software Architecture, Development Environment, Programming Principles, Computer Programming, Other Programming Languages, Network Security, Communication Systems, Data Sharing
★ 2.9 (46) · Intermediate · Specialization · 3 - 6 Months

Google Cloud
Skills you'll gain: API Gateway, Application Programming Interface (API), Cloud API, API Design, Application Deployment, Restful API, Continuous Deployment, AI Integrations, Cloud Deployment, LLM Application, Web Services, AI Security, CI/CD, AI Workflows, Token Optimization, Prompt Patterns, Proxy Servers, Large Language Modeling, Application Lifecycle Management, Simple Object Access Protocol (SOAP)
★ 4.6 (1.1K) · Beginner · Course · 1 - 3 Months

Skills you'll gain: Microarchitecture, Memory Management, System Programming, Embedded Software, Hardware Architecture, Embedded Systems, Computer Architecture, Programming Principles, System Configuration, Debugging
★ 4.7 (52) · 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

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

Princeton University
Skills you'll gain: Data Structures, Algorithms, Java Programming, Java, Graph Theory, Computer Programming, Computational Thinking, Spatial Data Analysis, Theoretical Computer Science, Memory Management, Simulations, Performance Tuning
★ 4.8 (84) · Intermediate · Course · 3 - 6 Months

Dartmouth College
Skills you'll gain: Command-Line Interface, Linux Commands, Linux, Embedded Software, Embedded Systems, Linux Servers, Computer Engineering, File Systems, Unix, C (Programming Language), File Management, Memory Management, Computer Programming, Open Source Technology, OS Process Management, Build Tools
★ 4.7 (35) · Beginner · Course · 1 - 3 Months

Johns Hopkins University
Skills you'll gain: Performance Tuning, Memory Management, System Programming, Hardware Architecture, Program Development, Computer Architecture, Performance Testing, Computer Hardware, Algorithms
★ 2.9 (67) · Intermediate · Course · 1 - 3 Months

Nanjing University
Skills you'll gain: Debugging, Computer Systems, Computer Architecture, Microarchitecture, System Programming, System Software, Computational Logic, Programming Principles, Hardware Architecture, Data Storage, Operating Systems, Secure Coding, Data Structures, Application Security, Memory Management, Exploit development
★ 4.7 (59) · Mixed · Course · 1 - 3 Months