Free programming courses can help you learn coding languages like Python, JavaScript, and Ruby, along with foundational concepts such as algorithms and data structures. You can build practical skills in web development, software debugging, and creating applications, which are crucial for tackling real-world challenges.

Microsoft
Skills you'll gain: Multi-Factor Authentication, Data Security, Security Strategy, Azure Active Directory, Database Architecture and Administration, Virtual Machines, Microsoft Azure, Cloud Security, Security Controls, Identity and Access Management, Network Security, Role-Based Access Control (RBAC), Encryption, Threat Detection
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Data Structures, File I/O, Network Routing, Computer Networking, Object Oriented Programming (OOP), Python Programming, Network Routers, Algorithms, Computer Programming
Intermediate · Guided Project · Less Than 2 Hours

Coursera
Skills you'll gain: Constructive Feedback, Writing, Education Software and Technology, Literacy
Beginner · Guided Project · Less Than 2 Hours

Skills you'll gain: Bash (Scripting Language), Shell Script, Linux, Scripting, Linux Commands, Linux Administration, Unix Shell, Operating System Administration, Data Persistence, Unix Commands, Systems Administration, Command-Line Interface, IT Automation, Unix, Cloud Hosting, Object-Relational Mapping, YAML, Python Programming, File Transfer Protocol (FTP), Automation
Beginner · Specialization · 3 - 6 Months

Google Cloud
Skills you'll gain: Feature Engineering, Data Preprocessing, Dataflow, Tensorflow, Applied Machine Learning, Data Transformation, Keras (Neural Network Library), Data Pipelines, Data Modeling, Machine Learning, Python Programming, Statistical Methods
Intermediate · Course · 1 - 3 Months

Skills you'll gain: File Management, Integrated Development Environments, Amazon Web Services, Command-Line Interface, Software Development Tools, Development Environment, Cloud Infrastructure, Python Programming
Beginner · Guided Project · Less Than 2 Hours
University of Toronto
Skills you'll gain: Scientific Visualization, Data Visualization Software, Statistical Visualization, Interactive Data Visualization, Bioinformatics, Ggplot2, Visualization (Computer Graphics), R (Software), Dimensionality Reduction, Scatter Plots, R Programming, Network Analysis, Exploratory Data Analysis, Heat Maps, Molecular Biology, Design Thinking
Intermediate · Course · 1 - 3 Months

École normale supérieure
Skills you'll gain: Theoretical Computer Science, Combinatorics, Algorithms, Advanced Mathematics, Linear Algebra, Mathematical Modeling, Probability
Mixed · Course · 1 - 4 Weeks

Infosec
Skills you'll gain: Open Web Application Security Project (OWASP), Secure Coding, Application Security, Web Applications, Javascript, Web Development, Node.JS, Security Controls, Web Servers, Hypertext Markup Language (HTML), Java Programming
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: File I/O, Matplotlib, Data Manipulation, Pandas (Python Package), Data Visualization, Data Persistence, NumPy, Data Processing, Scripting, Object Oriented Programming (OOP), Python Programming, Query Languages, Database Application, Databases, Relational Databases, Object Oriented Design, Data Import/Export, Debugging
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: COBOL (Programming Language), Debugging, z/OS, Unit Testing, Test Driven Development (TDD), Software Testing, Mainframe Computing, Integrated Development Environments, File I/O
Beginner · Course · 1 - 3 Months

Case Western Reserve University
Skills you'll gain: Geostatistics, Exploratory Data Analysis, Spatial Data Analysis, Spatial Analysis, Geospatial Mapping, Geospatial Information and Technology, Statistical Modeling, R Programming, Statistical Analysis, Probability & Statistics, Data Analysis, Data-Driven Decision-Making, Regression Analysis, Correlation Analysis, Data Validation, Histogram, Box Plots, Simulation and Simulation Software, Model Evaluation
Beginner · Course · 1 - 3 Months