Theoretical computer science courses can help you learn algorithms, computational complexity, automata theory, and formal languages. You can build skills in problem-solving, mathematical reasoning, and algorithm analysis, that support tackling complex computational tasks. Many courses introduce tools like Python for algorithm implementation, LaTeX for typesetting mathematical documents, and software for simulating automata, allowing you to apply these concepts in practical scenarios.

University of Michigan
Skills you'll gain: Stored Procedure, Database Design, SQL, Relational Databases, NoSQL, PostgreSQL, Database Architecture and Administration, Database Systems, Database Theory, Data Modeling, Databases, JSON, Data Store, Scalability, Database Management, Distributed Computing, Cloud Applications, Text Mining, Query Languages, Natural Language Processing
Intermediate · Specialization · 3 - 6 Months

Scrimba
Skills you'll gain: Computational Thinking, Algorithms, Program Development, Software Development, Computer Programming, Data Structures, Javascript, Computer Science, Web Development
Intermediate · Course · 1 - 4 Weeks

EDUCBA
Skills you'll gain: Technical Drawing, Engineering Drawings, Mechanical Drawings, Computer Aided Three-Dimensional Interactive Application (CATIA), Assembly Drawing, 3D Modeling, Mechanical Design, Drafting and Engineering Design, Computer-Aided Design, Visualization (Computer Graphics), File Management, Engineering Design Process, Interoperability, User Interface (UI)
Beginner · Course · 1 - 3 Months

Scrimba
Skills you'll gain: Javascript, JavaScript Frameworks, Web Development, Application Development, Web Applications, JSON, Event-Driven Programming, Object Oriented Programming (OOP), Programming Principles, Computer Programming, Software Engineering, Functional Design, Computer Science
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Model View Controller, Software Design Patterns, Java Platform Enterprise Edition (J2EE), Project Design, Web Applications, Back-End Web Development, Server Side, Integrated Development Environments, Employee Performance Management, Registration, Databases, Authentications
Mixed · Course · 1 - 4 Weeks

Skills you'll gain: Web Content Accessibility Guidelines, User Experience Design, Design and Product, Digital Design, User Interface (UI), Technical Writing, Usability Testing, Design Research, User Centered Design, Content Creation, Style Guides, Content Strategy, Writing, Information Architecture, Product Design
Beginner · Course · 1 - 3 Months

National Taiwan University
Skills you'll gain: Operations Research, Mathematical Modeling, Process Optimization, Business Mathematics, Applied Mathematics, Business Modeling, Industrial Engineering, Business Operations, Operations Management, Resource Allocation, Business Analytics, Production Planning, Inventory Management System, Case Studies, Microsoft Excel, Scheduling, Linear Algebra, Decision Making, Portfolio Management, Algorithms
Beginner · Course · 1 - 3 Months

University of Michigan
Skills you'll gain: UI/UX Research, Surveys, Qualitative Research, Usability Testing, User Experience Design, User Research, User Experience, User Story, Prototyping, Wireframing, User Centered Design, Survey Creation, Sampling (Statistics), Design Research, Interaction Design, Ideation, A/B Testing, Conceptual Design, Web Analytics, Usability
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Technical Design, Performance Tuning, Virtual Environment, Blended Learning
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Restful API, Flask (Web Framework), Application Deployment, Web Applications, Python Programming, IBM Cloud, Server Side, Artificial Intelligence, Code Review, Programming Principles, Development Environment, Unit Testing
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Jenkins, CI/CD, Continuous Integration, Test Automation, Continuous Delivery, Software Development, Application Deployment, DevOps, Unit Testing, Agile Methodology, Software Development Methodologies, Performance Testing, Application Performance Management, Application Programming Interface (API), GitHub
Intermediate · Course · 3 - 6 Months

Skills you'll gain: C# (Programming Language), Object Oriented Programming (OOP), Version Control, GitHub, User Accounts, Role-Based Access Control (RBAC), Microsoft Visual Studio, Git (Version Control System), Debugging, Microsoft SQL Servers, .NET Framework, Object-Relational Mapping, Full-Stack Web Development, Identity and Access Management, Development Environment, Database Management, Database Development, Application Development, Authorization (Computing), Microsoft Windows
Intermediate · Specialization · 1 - 3 Months