Network security courses can help you learn about firewalls, intrusion detection systems, and encryption protocols. You can build skills in risk assessment, incident response, and vulnerability management. Many courses introduce tools like Wireshark for network analysis, Nessus for vulnerability scanning, and various security information and event management (SIEM) systems, showing how these skills are applied in practical work to protect networks from cyber threats.

University of Pennsylvania
Skills you'll gain: Statistical Machine Learning, Data Preprocessing, Model Evaluation, PyTorch (Machine Learning Library), Statistical Methods, Probability, Probability & Statistics, Sampling (Statistics), Logistic Regression, Deep Learning, Probability Distribution, Statistical Modeling, Python Programming, Supervised Learning, Machine Learning, Agentic systems, Artificial Intelligence, Model Optimization, Algorithms, AI literacy
★ 4.5 (58) · Intermediate · Specialization · 3 - 6 Months

Columbia University
Skills you'll gain: Portfolio Management, Investment Management, Portfolio Risk, Asset Management, Investments, Risk Modeling, Estimation, Market Liquidity, Risk Management, Financial Market, Financial Trading, Model Optimization, Finance, Equities, Securities (Finance), Statistical Methods, Risk Analysis, Transaction Processing, Securities Trading, Market Dynamics
★ 4.6 (49) · Intermediate · Course · 1 - 3 Months

The Chinese University of Hong Kong
Skills you'll gain: Communication Systems, Digital Communications, Theoretical Computer Science, Telecommunications, Informatics, Probability, Probability Distribution, Algorithms
★ 4.7 (171) · Mixed · Course · 3 - 6 Months

Skills you'll gain: Operating System Administration, Local Area Networks, Software Installation, Command-Line Interface, Microsoft Windows, System Configuration, Systems Administration, TCP/IP, Linux Administration, Linux, General Networking, Patch Management, Operating Systems, User Accounts, Network Routers, System Monitoring, Network Troubleshooting, Mac OS, Identity and Access Management, Network Security
★ 4.9 (11) · Intermediate · Course · 1 - 3 Months

Coursera
Skills you'll gain: Invoicing, Billing & Invoicing, Inventory Management, Inventory Management System, Tax Management, Accounting Software, Customer Relationship Management, Billing, Customer Relationship Management (CRM) Software, Sales Tax, Small Business Accounting, Accounting and Finance Software, Accounting, Security Controls, Payroll Systems
★ 4.5 (86) · Beginner · Guided Project · Less Than 2 Hours

LearnQuest
Skills you'll gain: Predictive Modeling, Model Training, Predictive Analytics, Machine Learning Algorithms, Machine Learning, Algorithms, Machine Learning Methods, Responsible AI, Data Ethics, Artificial Intelligence and Machine Learning (AI/ML), Artificial Intelligence, Applied Machine Learning, Model Evaluation, AI literacy, Model Optimization, Ethical Standards And Conduct
★ 4.3 (14) · Beginner · Course · 1 - 4 Weeks

Coursera
Skills you'll gain: Cloud Management, Compliance Management, IT Automation, Infrastructure as Code (IaC), Governance Risk Management and Compliance, Terraform, Cloud Security, Cloud Engineering, Cost Control, Amazon Web Services, Governance, Data Governance, Compliance Auditing, Security Controls, Cost Management, Scripting, Advanced Analytics, Data-Driven Decision-Making, Analysis
Intermediate · Course · 1 - 4 Weeks

Skills you'll gain: Fraud detection, Reconciliation, Variance Analysis, Loss Prevention, Internal Controls, Asset Protection, Accounting Records, Financial Statement Analysis, Financial Controls, Financial Statements, Investigation
Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Database Software, Hardware Troubleshooting, Networking Hardware, Database Theory, Database Management Systems, Computer Networking, Network Support, Network Protocols, Computer Security Awareness Training, Security Software, Technical Support and Services, Cybersecurity, Encryption, Computer Literacy, Browser Compatibility, Program Development, Computing Platforms, Computer Programming, System Software, Database Management
★ 4.5 (12) · Beginner · Specialization · 1 - 3 Months

Skills you'll gain: JUnit, Test Driven Development (TDD), Version Control, Git (Version Control System), GitHub, Performance Tuning, Unit Testing, Data Structures, Java Programming, Development Testing, Algorithms, Program Development, Software Testing, Java, Test Automation, Test Case, Software Development, Scalability
★ 4 (64) · Beginner · Course · 1 - 4 Weeks

Scrimba
Skills you'll gain: TypeScript, Web Development Tools, React.js, Server Side, Javascript, Data Structures, Web Development, Programming Principles, Middleware, Scalability, Web Design, Computer Programming, Maintainability, UI Components
★ 4.6 (60) · Intermediate · Course · 1 - 4 Weeks

University of Colorado Boulder
Skills you'll gain: Computational Logic, Mathematical Modeling, Model Based Systems Engineering, Systems Design, Theoretical Computer Science, Verification And Validation, System Requirements, Systems Architecture, Automation Engineering, Functional Specification, Agentic systems, Control Systems, Mechanics, Requirements Analysis, Systems Analysis, Safety Assurance, Linear Algebra, Mathematical Theory & Analysis, Differential Equations, Algorithms
★ 3.5 (39) · Intermediate · Specialization · 3 - 6 Months