Troubleshooting

Learn the Docker commands developers use most often to build images, run containers, inspect applications, manage images, view logs, and clean up unused resources.

Learn how to use Wireshark to capture and analyze network traffic. Understand packets, protocols, display filters, TCP conversations, DNS requests, HTTP traffic, and a practical troubleshooting workflow.

Learn how npm manages JavaScript project dependencies, scripts, versions, and lockfiles. Build a practical Node.js project and understand package.json, npm install, npm scripts, devDependencies, and package-lock.json.

Learn how Nmap port scanning works by running practical scans against a local machine and an authorized test target. Understand open, closed, and filtered ports, service detection, useful scan options, and how to turn Nmap output into actionable security information.

Learn how to build secure direct-to-S3 file uploads using presigned URLs. This practical tutorial shows how your backend can authorize an upload while the browser sends the file directly to Amazon S3.

Confused about which tech career to choose in 2026? Compare software development, cloud and DevOps, AI and machine learning, data, cybersecurity, and other paths using skills, projects, entry-level opportunities, and long-term career fit.