Number theory courses can help you learn prime numbers, divisibility rules, modular arithmetic, and integer properties. You can build skills in problem-solving, logical reasoning, and algorithmic thinking, that support tackling complex mathematical challenges. Many courses introduce tools like Python for implementing algorithms and mathematical software for exploring number patterns, enabling you to apply your knowledge in practical situations such as cryptography and coding theory.

Johns Hopkins University
Skills you'll gain: Open Source Technology, Package and Software Management, Unit Testing, GitHub, Version Control, Rmarkdown, Cross Platform Development, Software Versioning, Software Documentation, R Programming, Knitr, Continuous Integration, Development Testing, Technical Documentation
Intermediate · Course · 1 - 4 Weeks

Lund University
Skills you'll gain: Sustainable Development, Systems Thinking, Sustainable Business, Sustainable Technologies, Sustainability Standards, Policy Development, Environmental Policy, Environmental Science, Climate Change Programs, Innovation, Environment and Resource Management, Natural Resource Management, Mathematical Modeling, Governance, Geospatial Information and Technology
Beginner · Course · 1 - 3 Months

Infosec
Skills you'll gain: Blockchain, Network Security, Security Engineering, Computer Security, Infrastructure Security, Data Security, Cryptography, Cryptographic Protocols, Secure Coding, Encryption, Vulnerability Assessments, Key Management, Scalability, Distributed Computing, Data Integrity, Exploitation techniques, Algorithms
Beginner · Course · 1 - 3 Months

Corporate Finance Institute
Skills you'll gain: Environmental Social And Corporate Governance (ESG), Corporate Sustainability, Sustainable Business, Compliance Management, Business Risk Management, Business Intelligence, Stakeholder Analysis, Environmental Issue, Corporate Strategy, Governance, Performance Analysis, Case Studies
Beginner · Course · 1 - 3 Months

University of Colorado Boulder
Skills you'll gain: Statistical Hypothesis Testing, Statistical Methods, Statistical Analysis, Probability & Statistics, Data Ethics, Statistical Inference, Quantitative Research, Sampling (Statistics), Probability Distribution
Build toward a degree
Intermediate · Course · 1 - 3 Months

Copenhagen Business School
Skills you'll gain: Sustainable Business, Corporate Sustainability, Stakeholder Engagement, Sustainable Development, Business Modeling, Innovation, Environmental Social And Corporate Governance (ESG), Marketing Communications, Business Strategies, Case Studies, Systems Thinking, Strategic Partnership
Beginner · Course · 1 - 3 Months

Curtis Institute of Music
Skills you'll gain: Classical Music, Music Theory, Music, Music History, Musical Composition
Beginner · Course · 1 - 3 Months

Nanyang Technological University, Singapore
Skills you'll gain: Systems Thinking, Case Studies, Network Analysis, Mathematical Modeling, Simulations, Systems Engineering, Social Sciences, Applied Mathematics, Sustainable Systems, Policy Analysis, Forecasting, Critical Thinking, Jupyter
Beginner · Course · 1 - 3 Months

Dartmouth College
Skills you'll gain: Talent Management, People Development, Professional Networking, Collaboration, Leadership Development, Team Motivation, Teamwork, People Management, Entrepreneurship, Innovation, Leadership and Management, Leadership, Creativity, Employee Coaching, Mentorship, Influencing, Employee Retention, Recruitment Strategies, Growth Strategies
Beginner · Course · 1 - 4 Weeks

University of Michigan
Skills you'll gain: Music Theory, Classical Music, Music History, Musical Composition, Music, Instrumental Music, Music Performance
Intermediate · Specialization · 1 - 3 Months

École Polytechnique Fédérale de Lausanne
Skills you'll gain: Traffic Flow Optimization, Land Development, Spatial Analysis, Civil Engineering, Concept Of Operations, Systems Thinking, Socioeconomics, Social Sciences, Sustainable Development, Public Policies
Mixed · Course · 1 - 3 Months

Universidad de Palermo
Skills you'll gain: Social Skills, Verbal Communication Skills, Leadership, Emotional Intelligence, Communication, Leadership and Management, Leadership Development, Team Leadership, Business Leadership, Empathy & Emotional Intelligence, Organizational Leadership, Team Building, Interpersonal Communications, Communication Strategies, Industrial and Organizational Psychology, People Development, Non-Verbal Communication, Coaching, Cognitive flexibility, Goal Setting
Beginner · Course · 1 - 4 Weeks