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: Journalism, Health Education, Public Health, Media and Communications, Interviewing Skills, Stress First Aid, Advocacy, Mental Health, Cultural Sensitivity, Ethical Standards And Conduct
Beginner · Course · 1 - 4 Weeks

Coursera
Skills you'll gain: Data Preprocessing, Java, Data Structures, File I/O, Java Programming
Intermediate · Guided Project · Less Than 2 Hours

University of Colorado Boulder
Skills you'll gain: Physics, Materials science, Physical Science, Mathematical Modeling, Advanced Mathematics, Calculus, Applied Mathematics
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Adobe InDesign, Layout Design, Color Theory, Multimedia, Typography, Graphic Design, Design, Graphic and Visual Design Software, Design Elements And Principles, Style Guides, Document Management, Digital Publishing
Beginner · Course · 1 - 3 Months

University of Colorado Boulder
Skills you'll gain: Crisis Management, Systems Thinking, Stakeholder Communications, Disaster Recovery, Leadership, Threat Management, Climate Change Adaptation, Resilience, Change Management, Threat Detection, Infrastructure Security, Business Continuity, Organizational Change, Engineering Management, Emergency Response, Business Ethics, Communication, Risk Analysis, Systems Engineering, Sustainable Development
Build toward a degree
Intermediate · Specialization · 3 - 6 Months

Skills you'll gain: Lean Six Sigma, Lean Methodologies, Statistical Hypothesis Testing, Correlation Analysis, Process Improvement, Sampling (Statistics), Project Management, Data Literacy, Regression Analysis, Process Capability, Goal Setting, Statistical Analysis, Scatter Plots, Customer experience improvement, Quality Management, Microsoft Excel, Process Mapping, Risk Management, Root Cause Analysis
Mixed · Course · 1 - 4 Weeks

Tecnológico de Monterrey
Skills you'll gain: Business Modeling, Business Architecture, Entrepreneurship, Storytelling, Design Thinking, Business Strategies, Business Strategy, Innovation, Strategic Thinking, Systems Thinking, Business, Presentations, Media and Communications, Case Studies, Market Opportunities, Value Propositions, Competitive Analysis
Advanced · Course · 1 - 4 Weeks

Universitat Autònoma de Barcelona
Skills you'll gain: Climate Change Adaptation, Supply And Demand, Sustainable Development, Market Dynamics, International Relations, Climate Change Mitigation, Economics, Environmental Regulations, Environmental Policy, Mathematical Modeling, Tax Laws, Social Impact, Public Policies, Cost Benefit Analysis, Big Data
Beginner · Course · 1 - 3 Months

University of the Arts London
Skills you'll gain: Sustainable Business, Sustainable Development, Community Organizing, Sustainable Systems, Corporate Sustainability, Creative Thinking, Sustainability Standards, Systems Thinking, Design, Ideation, Case Studies, Prototyping
Beginner · Course · 1 - 4 Weeks

LearnKartS
Skills you'll gain: Bitbucket, Git (Version Control System), Version Control, Collaborative Software, Code Review, Command-Line Interface
Intermediate · Course · 1 - 4 Weeks

Skillshare
Skills you'll gain: Adobe After Effects, Motion Graphics, Animations, Multimedia, Logo Design, Cinematography, Video Editing, 3D Modeling, Adobe Illustrator, Adobe Photoshop, Computer Graphics, Creative Design, Typography, Graphical Tools, Graphic Design, File Management, Color Theory
Beginner · Specialization · 1 - 3 Months

Korea Advanced Institute of Science and Technology(KAIST)
Skills you'll gain: Chemical Engineering, Energy and Utilities, Chemical and Biomedical Engineering, Engineering, Process Engineering, Thermal Management, Environmental Engineering, Sustainable Engineering, Engineering Calculations, Mathematical Modeling
Intermediate · Course · 1 - 3 Months