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.

University of California, Davis
Skills you'll gain: Social Network Analysis, Network Analysis, Data Wrangling, Natural Language Processing, Web Scraping, Social Sciences, Data Ethics, Databases, Artificial Intelligence, Research, Simulations, Big Data, Systems Thinking, Trend Analysis, Data Science, Artificial Intelligence and Machine Learning (AI/ML), Research Methodologies, Machine Learning, Data Collection, Agentic systems
Beginner · Specialization · 3 - 6 Months

Skills you'll gain: Cash Flows, Business Valuation, Financial Statement Analysis, Financial Analysis, Balance Sheet, Financial Modeling, Profit and Loss (P&L) Management, Business Metrics, Case Studies, Return On Investment, Financial Forecasting, Market Analysis, Market Dynamics
Mixed · Course · 1 - 4 Weeks

University of Colorado Boulder
Skills you'll gain: Database Design, SQL, Database Management Systems, NoSQL, Database Development, Relational Databases, Data Warehousing, Database Theory, Database Systems, Database Administration, Databases, Database Architecture and Administration, Database Software, Database Management, Data Modeling, Query Languages, MongoDB, Big Data, Data Architecture, Database Application
Build toward a degree
Beginner · Specialization · 3 - 6 Months

GitLab
Skills you'll gain: Telecommuting, Virtual Teams, Team Management, Human Resources Management and Planning, Culture Transformation, Performance Metric, Leadership and Management, Organizational Change, Organizational Strategy, Business Transformation, Organizational Leadership, Team Building, Performance Management, Adaptability, Collaboration, Business Strategy, Communication
Intermediate · Course · 1 - 3 Months

Illinois Institute of Technology
Skills you'll gain: Process Improvement, Pay Per Click Advertising, Digital Marketing, Responsible AI, Process Management, Global Marketing, Business Process, Digital Transformation, Culture Transformation, Financial Statement Analysis, Machine Learning Algorithms, Capital Budgeting, Product Lifecycle Management, Market Dynamics, Paid media, Design Thinking, Leadership and Management, Game Theory, Microsoft Excel, Business Strategy
Earn a degree
Degree · 1 - 4 Years

Skills you'll gain: User Experience Design, Usability, User Experience, User Interface and User Experience (UI/UX) Design, Threat Modeling, UI/UX Strategy, Interaction Design, Application Security, Authentications, Human Centered Design, Security Strategy, Usability Testing, Authorization (Computing), Security Controls, Multi-Factor Authentication, Security Awareness, Computer Security Awareness Training, Cybersecurity, Safety Standards, Information Privacy
Intermediate · Course · 1 - 3 Months

Skills you'll gain: Apache Hadoop, Apache Hive, Big Data, Database Design, Data Processing, Distributed Computing, Scalability, Data Pipelines, Extract, Transform, Load, Data Warehousing, Query Languages, Data Cleansing, Data Transformation, Data Management, Analytics
Mixed · Course · 1 - 4 Weeks

LearnKartS
Skills you'll gain: Scope Management, Project Scoping, Leadership and Management, Project Management Institute (PMI) Methodology, Project Management, Meeting Facilitation, Team Leadership, Resource Management, Project Management Life Cycle, Leadership, Project Portfolio Management, Team Building, Scheduling, Project Planning, Ethical Standards And Conduct, Project Risk Management, Work Breakdown Structure, Stakeholder Management
Beginner · Course · 1 - 4 Weeks

Microsoft
Skills you'll gain: CI/CD, GitHub, C# (Programming Language), HTML and CSS, Load Balancing, Continuous Integration, Git (Version Control System), Role-Based Access Control (RBAC), Scalability, Object Oriented Programming (OOP), Authentications, ASP.NET, Full-Stack Web Development, Web Development, Debugging, SQL, Application Deployment, Microsoft Copilot, .NET Framework, Graph Theory
Beginner · Professional Certificate · 3 - 6 Months

AI CERTs
Skills you'll gain: Application Deployment, Application Programming Interface (API), Application Security, Software Development Tools, Blockchain, Application Development, Systems Integration, Cryptography, Solution Architecture, Scripting, FinTech, Emerging Technologies, Scalability
Advanced · Course · 1 - 3 Months

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

Skills you'll gain: Git (Version Control System), GitHub, Version Control, Collaborative Software, Web Applications, Open Source Technology, Command-Line Interface, DevOps
Beginner · Course · 1 - 4 Weeks