Tutorials
Step-by-step technical guides on Docker, Linux, Python, Go, and more.
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PostgreSQL EXPLAIN ANALYZE: Fix Slow Queries with Proper Indexes (2026)
Master PostgreSQL EXPLAIN ANALYZE in 2026. Read query plans, create B-tree, partial, GIN, and expression indexes. Real case study: 30-second query reduced to 50ms step by step.
Prometheus + Grafana: Linux Server Monitoring from Scratch (2026)
Set up Prometheus 3.10, Node Exporter 1.10, and Grafana 12.4 on Linux from scratch. Import dashboard 1860, write PromQL alerts, configure Alertmanager for Slack and email notifications.
Python asyncio: async/await with Real Examples (APIs, Scraping, Database)
Python asyncio tutorial 2026 with real examples. Fetch 10 URLs concurrently with httpx, async web scraping with aiohttp, SQLAlchemy async sessions, asyncio.Queue producer-consumer pattern.
Python Type Hints and mypy: Write Self-Documenting Code (2026)
Python type hints and mypy tutorial 2026. Cover Optional, Union, TypedDict, Protocol, Generics. Run mypy --strict to catch bugs before runtime. Essential for Pydantic v2 and FastAPI.
Rust for Python and Go Developers: Ownership Explained Without the Pain (2026)
Learn Rust in 2026 coming from Python or Go. Side-by-side code comparisons explain ownership, borrowing, lifetimes, Option, Result, and traits — without fighting the borrow checker alone.
uv: The Python Package Manager That Replaces pip, pyenv, and Poetry (2026)
uv replaces pip, pyenv, virtualenv, poetry, and pipx in one Rust-powered tool. 10-100x faster than pip. Complete tutorial: install, manage Python versions, lock files, CI/CD, PEP 723 scripts.
WireGuard VPN on Linux: Complete Server and Client Setup (2026)
Set up WireGuard VPN on Linux in 10 minutes. Configure server, generate keys, add multiple clients, provision mobile via QR code, add pre-shared keys for post-quantum resistance.
Aider: AI Pair Programming from the Terminal — Complete Guide 2026
Complete 2026 guide to Aider, the AI pair programming tool for your terminal. Connect to Claude or GPT-4o, auto-commit changes with git, use architect mode, and manage costs.
Ansible for Linux Sysadmins: Automate Server Configuration with Playbooks (2026)
Learn Ansible for Linux sysadmins. Install Ansible, write your first playbook, use roles, manage inventory, and automate server configuration in 2026.
Claude API with Python: Complete Tutorial 2026 (Messages, Streaming, Vision)
Learn to use the Claude API with Python. Complete 2026 guide covering messages, streaming, vision, tool use, and async. Install anthropic SDK and build your first AI app.