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Practical tutorials and explanations grounded in reproducible environments, exact versions, and observable results.

Graduate & Engineering Learning Tracks

Track 01 · Foundations

Core Engineering & Computer Science

Data structures, memory management, OS internals, and networking fundamentals for technical interviews.

Track 02 · Web & APIs

Modern Web & Distributed API Architecture

React 19, RSC, Next.js 16 App Router, SQL query optimization, and resilient API design.

Track 03 · Infrastructure

DevOps, Cloud Native & Containerization

Docker, Kubernetes, Linux CLI cheatsheets, CI/CD automation, and Sentry observability.

Track 04 · System Design

System Design & Distributed Architecture

Load balancing, Redis caching strategies, database sharding, and fault-tolerant message queues.

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Essential Open-Source Linux Tools for Systems Debugging & Performance Profiling

Master essential open-source Linux performance and debugging tools: strace, ltrace, perf, Valgrind, iostat, ss, and iperf3 with command workflows.

Android audio_policy_configuration.xml Architecture & Setup

Learn how Android Audio HAL routes streams, maps mixPorts to devicePorts, and configures audio_policy_configuration.xml for custom BSP hardware.

What Do the Colors in ls Output Mean? A Practical Guide

Blue is a directory, green is executable, red means broken or compressed. Here is the full color code for GNU ls, plus a two-minute way to prove each one to yourself.

How to Set Up TFTP Server on Ubuntu (tftpd-hpa Guide)

Set up a TFTP server on Ubuntu using tftpd-hpa: learn configuration, permission fixes, ufw firewall setup, and U-Boot embedded kernel image transfers.

Use TShark to Analyze PCAP Files: Options Explained with Examples

TShark is the terminal-based sibling of Wireshark, used to capture and analyze packets directly in the command … Read more

How to Capture USB Packets in Wireshark on Linux (usbmon)

Sniff USB traffic on Linux using Wireshark and the usbmon kernel module: step-by-step setup, non-root udev permissions, and USB URB display filters.

TFTP Client Setup on Ubuntu: Install, Configure, and Transfer Files

TFTP is a lightweight UDP-based file transfer protocol used for booting devices, flashing firmware, and transferring files to routers, embedded devices, and switches. It's ideal when devices have limited resources or you need to push firmware or config during boot, at the cost of no authentication o

Building Kernel Modules In-Tree During Kernel Compilation

Kernel modules are usually built out-of-tree, but for modules tightly coupled with kernel internals it's better to build them in-tree, as part of the kernel compilation itself, for header and config compatibility and automatic compilation during make . The example below uses linux-5.10/ as the so

Clean Email Lists in Python: Remove Invalid, Unsubscribed, and Bounced Emails

Cleaning an email list removes invalid addresses, unsubscribed users, and hard-bounced addresses before a campaign. Sending to any of these hurts sender reputation and can violate GDPR/CAN-SPAM.