Text & Pipelines
Linux is a text-based system. Logs, configs, command output — it's all text. The Unix philosophy is built on tools that do one thing well, connected together. These two articles give you the connection mechanism and the most important filter.
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Connect commands into pipelines, route stdout and stderr to files, and understand the three streams that every process in Linux has open by default.
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Filter any stream to exactly the lines you need — by pattern, regex, context, or recursively across a directory. The workhorse of Linux investigation.
What's Next
Head to System to understand what's running on the machine — and how to find, inspect, and manage it.