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 Illinois Urbana-Champaign
Skills you'll gain: Distributed Computing, File Systems, Cloud Computing, Dataflow, Transaction Processing, Computer Security, Data Centers, Cyber Security Policies, Authorization (Computing), Apache Hadoop, Data Store, Database Theory, Cloud Security, Authentications, NoSQL, Algorithms, Data Integrity, Encryption, File Management, Graph Theory
★ 4.5 (323) · Mixed · Course · 1 - 3 Months

University of Colorado Boulder
Skills you'll gain: Bash (Scripting Language), Scalability, Distributed Computing, Shell Script, Computer Systems, Big Data, Linux Commands, Hardware Architecture, Operating Systems, Unix Shell, File Systems, Computing Platforms, Linux, Performance Testing, Scripting, Performance Tuning, Memory Management, Computer Architecture, Capacity Management, File Management
★ 3.8 (168) · Beginner · Course · 1 - 4 Weeks
University of London
Skills you'll gain: Computer Science, Computer Systems, Web Applications, Computer Literacy, General Networking, Network Security, Computer Networking, Application Security, Computational Thinking, Debugging, Cybersecurity, Software Architecture
★ 4.6 (582) · Beginner · Course · 1 - 4 Weeks

University of Colorado System
Skills you'll gain: Cryptography, Brute-force attacks, Cryptographic Protocols, Encryption, Key Management, Cybersecurity, Computer Security, Information Assurance, Theoretical Computer Science, Threat Modeling, Communication Systems
★ 4.5 (551) · Intermediate · Course · 1 - 4 Weeks

LearnQuest
Skills you'll gain: System Programming, Visual Basic (Programming Language), Database Management, System Software, Hardware Architecture, Databases, Relational Databases, Algorithms, Computer Architecture, Network Security, Computer Hardware, SQL, Computer Science, Computer Networking, Computer Programming, Network Protocols, Software Development, Automation, Cloud Computing, Debugging
★ 4.6 (117) · Beginner · Course · 1 - 3 Months

École normale supérieure
Skills you'll gain: Sampling (Statistics), Mathematical Software, Physics, Simulations, Numerical Analysis, Markov Model, Mechanics, Simulation and Simulation Software, Algorithms, Programming Principles, Applied Mathematics, Integral Calculus, Model Optimization, Program Development
★ 4.8 (274) · Mixed · Course · 1 - 3 Months

University of London
Skills you'll gain: Arithmetic, Theoretical Computer Science, Computational Logic, Programming Principles, Computer Science, Algorithms, Computational Thinking, Database Theory, Mathematical Modeling, Data Structures, General Mathematics, Applied Mathematics, Business Mathematics, Advanced Mathematics, Logical Reasoning, Problem Solving
★ 4.1 (7) · Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Algorithms, Graph Theory, Data Structures, Theoretical Computer Science, Computational Thinking, Mathematical Theory & Analysis, Analysis, Probability & Statistics, Probability, Design Strategies, Logical Reasoning
★ 4.8 (5.3K) · Intermediate · Course · 1 - 4 Weeks

University of California San Diego
Skills you'll gain: Graph Theory, Combinatorics, Network Analysis, Algorithms, Mathematical Modeling, Traffic Flow Optimization, Program Development
★ 4.5 (1.1K) · Beginner · Course · 1 - 3 Months

University of Leeds
Skills you'll gain: Logical Reasoning, Deductive Reasoning, Computational Logic, Computational Thinking, Algorithms, Artificial Intelligence, Cryptography, Graph Theory
★ 4.7 (35) · Beginner · Course · 1 - 4 Weeks

University of Colorado System
Skills you'll gain: Computational Thinking, C (Programming Language), Programming Principles, Computer Programming, Code Reusability, Data Storage
★ 4.6 (37) · Beginner · Course · 1 - 4 Weeks

University of Colorado Boulder
Skills you'll gain: OSI Models, Network Security, TCP/IP, Network Architecture, Network Protocols, Network Routing, Network Routers, Computer Networking, Infrastructure Security, Routing Protocols, Public Key Infrastructure, Network Model, Cryptographic Protocols, Web Applications, Application Servers
★ 4.6 (104) · Intermediate · Course · 1 - 3 Months