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.

AI CERTs
Skills you'll gain: Blockchain, Cryptography, Network Security, Security Engineering, Cybersecurity, Vulnerability Assessments, Public Key Cryptography Standards (PKCS), Transaction Processing, Data Validation, Distributed Computing, Data Integrity, Network Protocols, Verification And Validation
Beginner · Course · 1 - 4 Weeks

University of Minnesota
Skills you'll gain: Software Testing, JUnit, Verification And Validation, Unit Testing, Test Case, Test Automation, Development Testing, Test Planning, Code Coverage, Software Quality Assurance, Functional Testing, Testability, Integration Testing, Test Data, Issue Tracking
Intermediate · Course · 1 - 4 Weeks

American Museum of Natural History
Skills you'll gain: Environment, Systems Thinking, Environmental Science, Natural Resource Management, Environmental Resource Management, Biology, Sustainable Development, Environmental Engineering and Restoration, Case Studies, Mathematical Modeling
Intermediate · Course · 1 - 3 Months

LearnQuest
Skills you'll gain: Reinforcement Learning, Responsible AI, Agentic systems, Data Ethics, Artificial Intelligence, Machine Learning Methods, Distributed Computing, Simulations
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Prompt Engineering, ChatGPT, Generative AI, OpenAI, Multimodal Prompts, LLM Application, AI Product Strategy, Marketing Strategies, Productivity Software, Creative Design, Marketing Automation, Responsible AI, Natural Language Processing, Application Programming Interface (API), A/B Testing, Time Management
Beginner · Course · 1 - 3 Months

West Virginia University
Skills you'll gain: Sales Management, Sales Territory Management, Recruitment, Sales Training, Sales Strategy, Account Management, Sales, General Sales Practices, Training and Development, Talent Recruitment, Expense Management, Sales Process, Organizational Structure, Inside Sales, Marketing Budgets, Business Ethics, Employee Training, Legal Risk, Operating Expense, Compensation Strategy
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Object Oriented Design, Computer Programming
Intermediate · Course · 1 - 4 Weeks
Ludwig-Maximilians-Universität München (LMU)
Skills you'll gain: Game Theory, Business Strategy, Strategic Thinking, Competitive Analysis, Strategic Partnership, Product Strategy, Strategic Decision-Making, Market Opportunities, Go To Market Strategy, Market Dynamics, New Product Development, Market Analysis, Product Design, Innovation
Mixed · Course · 1 - 3 Months

Skills you'll gain: Lean Six Sigma, Organizational Change, Lean Methodologies, Six Sigma Methodology, Organizational Leadership, Project Scoping, Root Cause Analysis, Statistical Analysis, Statistical Methods, Process Improvement, Process Analysis, Quality Improvement, Continuous Quality Improvement (CQI), Process Capability, Statistical Hypothesis Testing, Data Analysis, Kanban Principles, Waste Minimization
Mixed · Course · 1 - 4 Weeks

Lund University
Skills you'll gain: Legal Research, Law, Regulation, and Compliance, International Relations, European History, Regulatory Compliance, Business Economics, Compliance Management, Environmental Laws, E-Commerce, Public Policies, Case Law, Labor Law, Commercial Laws, Governance
Beginner · Course · 1 - 3 Months

The Chinese University of Hong Kong
Skills you'll gain: Operations Research, Applied Mathematics, Mathematical Modeling, Problem Solving, Combinatorics, Graph Theory, Decision Support Systems, Computational Thinking, Data Modeling
Intermediate · Course · 1 - 4 Weeks

University of Michigan
Skills you'll gain: Color Theory, Performing Arts, Design, Workplace inclusivity, Diversity Awareness, Cultural Sensitivity, Diversity Equity and Inclusion Initiatives, Detail Oriented, Creativity, Adaptability
Beginner · Course · 1 - 3 Months