Linux security courses can help you learn system hardening, user access controls, network security protocols, and incident response strategies. You can build skills in configuring firewalls, implementing encryption techniques, and conducting security audits. Many courses introduce tools like iptables for firewall management, OpenSSL for encryption, and Wireshark for network analysis, showing how these skills are applied in practical work to protect systems from vulnerabilities and threats.

UNSW Sydney (The University of New South Wales)
Skills you'll gain: Requirements Analysis, Requirements Management, Requirements Elicitation, Business Requirements, Technical Writing, Functional Requirement, Product Requirements, Engineering Documentation, Business Writing, System Requirements, Project Documentation, Proofreading, Editing, Systems Engineering
★ 4.6 (356) · Beginner · Course · 1 - 4 Weeks

Skills you'll gain: Penetration Testing, Exploit development, Network Security, Vulnerability, Cybersecurity, Vulnerability Assessments, Human Factors (Security), Information Systems Security
★ 4.3 (31) · Intermediate · Course · 1 - 3 Months

Skills you'll gain: Blockchain, Secure Coding, Penetration Testing, Front-End Web Development, Application Development, Security Testing, Web Development Tools, Application Security, Development Environment, Event Monitoring, Exploit development, Frontend Integration, Web Development, Software Development Tools, Cyber Security Assessment, Payment Systems, Transaction Processing, Authorization (Computing), Token Optimization, Role-Based Access Control (RBAC)
★ 4.9 (143) · Beginner · Specialization · 3 - 6 Months

LearnKartS
Skills you'll gain: Infrastructure Architecture, Cloud Computing, Cloud Solutions, Cloud Hosting, Cost Reduction, Cost Management, Network Architecture, Database Management, Operational Databases, Network Planning And Design, Load Balancing, Virtual Private Networks (VPN), Technical Support, Network Security, Resource Management, Customer Support, Configuration Management
★ 4.4 (134) · Beginner · Specialization · 1 - 3 Months

University of Minnesota
Skills you'll gain: Test Automation, Regression Testing, Software Testing, Software Engineering Tools, Test Tools, Computer Programming Tools, White-Box Testing, Code Coverage, Security Testing, Verification And Validation, Test Case, Test Data, Automation, Functional Requirement, Application Security, Vulnerability Scanning
★ 4.2 (86) · Intermediate · Course · 1 - 4 Weeks

Knowledge Accelerators
Skills you'll gain: Cyber Security Policies, AI Security, Threat Management, Cybersecurity, Cyber Attacks, Cyber Risk, Email Security, Endpoint Security, Mobile Security, Remote Access Systems, Multi-Factor Authentication, Artificial Intelligence, Cloud Computing
★ 4.9 (45) · Beginner · Course · 1 - 3 Months

Google Cloud
Skills you'll gain: Google Docs, Gmail, Google Sheets, Presentations, Google Workspace, Calendar Management, Spreadsheet Software, File Management, Version Control, Document Management, Excel Formulas, Excel Macros, Data Visualization, Sales Presentations, Setting Appointments, Document Control, Meeting Facilitation, Productivity Software, Email Security, Collaborative Software
★ 4.7 (641) · Beginner · Specialization · 3 - 6 Months

Skills you'll gain: IT Security Architecture, Incident Response, Computer Security Incident Management, Zero Trust Network Access, Cloud Computing Architecture, Authentications, Endpoint Detection and Response, Risk Analysis, Network Security, Compliance Training, Risk Mitigation, Risk Management Framework, Cyber Governance, Regulatory Compliance, Cloud Computing, Data Security, Application Security, Cyber Risk, Information Systems Security, Risk Management
★ 4.8 (13) · Intermediate · Specialization · 1 - 3 Months

Board Infinity
Skills you'll gain: Restful API, Secure Coding, Application Deployment, Web Development, API Design, Full-Stack Web Development, Security Controls, Scripting Languages, Cloud API, Software Documentation, Software Installation, Data Validation
★ 4.2 (195) · Intermediate · Course · 1 - 4 Weeks

University of Colorado System
Skills you'll gain: Cryptography, Cybersecurity, Encryption, Public Key Cryptography Standards (PKCS), Data Integrity
★ 4.5 (428) · Beginner · Course · 1 - 4 Weeks

LearnKartS
Skills you'll gain: Salesforce Development, User Provisioning, Identity and Access Management, Enterprise Application Management, Application Deployment, Security Management, Customer Relationship Management (CRM) Software, Workflow Management, Account Management, Internal Communications, Training and Development, Data Management, Business Process Automation, Customer Service, Security Controls
★ 3.8 (68) · Beginner · Specialization · 1 - 3 Months

LearnQuest
Skills you'll gain: Microsoft Azure, Infrastructure As A Service (IaaS), Network Administration, Network Infrastructure, Cloud Deployment, Cloud Computing, Data Storage, Cloud Management, Dashboard Creation, Cloud Platforms
★ 4.4 (512) · Beginner · Course · 1 - 3 Months