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.

Infosec
Skills you'll gain: Linux Administration, Version Control, Linux, Git (Version Control System), Linux Commands, Network Troubleshooting, Operating System Administration, Bash (Scripting Language), Systems Administration, Scripting, Shell Script, User Accounts, System Configuration, Network Administration, File Management, Identity and Access Management, General Networking, Firewall, Command-Line Interface, Security Controls
Intermediate · Course · 1 - 3 Months

Copenhagen Business School
Skills you'll gain: Social Justice, Public Policies, Liberal Arts, Digital Transformation, Community Development, Policy Development, Culture, Innovation, Creativity, Technology Strategies, Diversity Equity and Inclusion Initiatives, Emerging Technologies
Beginner · Course · 1 - 3 Months

Skills you'll gain: Photo Editing, Photography, Image Quality, Post-Production, Color Theory
Beginner · Course · 1 - 4 Weeks

Skillshare
Skills you'll gain: Adobe Photoshop, Photo Editing, Adobe Creative Cloud, Generative AI, Graphic and Visual Design, Graphic Design, Graphical Tools, Creative Design, Design, Typography, Image Quality, Graphics Software, Color Theory
Beginner · Specialization · 1 - 3 Months

Johns Hopkins University
Skills you'll gain: Editing, Student-Centred Learning, Student Engagement, Instructional Strategies, Peer Review, Writing, Differentiated Instruction
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Team Performance Management, Business Planning, Resource Management, Business Acumen, Organizational Effectiveness, Strategic Thinking, Business Strategy, Financial Management, Strategic Decision-Making, Organizational Change, Team Leadership, Financial Analysis, Financial Statements, Budgeting
Beginner · Course · 1 - 4 Weeks

O.P. Jindal Global University
Skills you'll gain: Public Policies, Policy Development, Policy Analysis, Political Sciences, Economics, Policy, and Social Studies, Advocacy, Environmental Policy, Behavioral Economics, Public Administration, Program Evaluation, Ethical Standards And Conduct, Governance, Systems Thinking
Build toward a degree
Beginner · Course · 1 - 3 Months

University of Michigan
Skills you'll gain: Injury Prevention, Child Welfare, Substance Abuse, Public Health, Public Safety and National Security, Epidemiology, Health Disparities, Community Health, Family Law, Health Policy, Risk Analysis, Program Evaluation, Mental Health, Research
Beginner · Course · 1 - 3 Months

Skillshare
Skills you'll gain: Adobe After Effects, Motion Graphics, Animations, Multimedia, Logo Design, Video Editing, Adobe Illustrator, Adobe Photoshop, 3D Assets, Computer Graphics, Creative Design, Typography, Graphic Design, File Management, Color Theory, Image Quality
Beginner · Specialization · 1 - 3 Months
Codio
Skills you'll gain: Matplotlib, Version Control, Text Mining, GitHub, Large Language Modeling, Django (Web Framework), Package and Software Management, Platform As A Service (PaaS), Plot (Graphics), Application Deployment, Object-Relational Mapping, Natural Language Processing, Data Visualization Software, Unit Testing, Data Visualization, Jupyter, Development Environment, LLM Application, Virtual Environment, Python Programming
Intermediate · Specialization · 1 - 3 Months

University of London
Skills you'll gain: Leadership and Management, Organizational Structure, Organizational Leadership, Music, Business Management, Storytelling, Leadership, Productivity, Workforce Management, Innovation, Writing and Editing, Employee Engagement, Analysis
Beginner · Course · 1 - 4 Weeks

Northeastern University
Skills you'll gain: Database Management Systems, Data Modeling, Database Design, Database Theory, NoSQL, Big Data, Data Governance, Database Architecture and Administration, Data Storage, Data Integration, Unified Modeling Language, Apache Hadoop, MongoDB, Apache Spark
Mixed · Course · 1 - 4 Weeks