How lrzsz, ZMODEM, terminal streams, PTYs, iTerm2 coprocesses, and nested SSH sessions work together

Buffer vs Cache in Linux — what each really caches, how free and /proc/meminfo define them, and how to verify

Step-by-step walkthrough of how Linux translates a file path into physical disk blocks, with commands to demonstrate each step

a setup list for vps linux server

systemd in nutshell

CPU hardware topology, Linux scheduling, NUMA, and practical troubleshooting commands

File System Overview

Linux Memroy Overview