Foundation
A hand-curated almanac of foundational lessons in the Ciechanowski tradition. Generated locally, published when ready.
Volumes
02Essays
19-
№ 01
HR Compliance and Payroll in India: A Beginner's Guide
HR compliance means following the laws that govern how employees are treated and paid at work. In India those laws are now organised into four Labour Codes, backed by schemes like EPF, ESI and gratuity. Payroll is the monthly process that pays each employee correctly — Basic, allowances, EPF, Professional Tax and TDS — and deposits every statutory due on time. Getting either wrong invites penalties.
concept intro ~30 min -
№ 02
KPI Calculation for Team Performance: Sprint, Monthly, and Quarterly
A ground-up guide to calculating and interpreting team performance KPIs across sprint, monthly, and quarterly cadences — covering velocity, cycle time, defect escape rate, predictability, and health portfolios — with interactive widgets that expose the hidden value judgments baked into every formula.
concept advanced ~30 min -
№ 03
School Timetabling with CP-SAT
Build a working school timetabling script in Python using Google OR-Tools' CP-SAT solver. Learn constraint programming from first principles: variables, domains, hard and soft constraints, propagation, and how to decode solver output into a readable schedule.
skill advanced ~30 min -
№ 04
Business Studies: The Fundamentals
From lemonade stands to billion-dollar companies — business is just organised value exchange. Learn revenue, costs, profit, supply & demand, and business models through concrete interactive examples.
concept intro ~30 min -
№ 05
Mendel's Laws of Inheritance
A deep-dive into Mendel's three laws — segregation, independent assortment, and dominance — tracing the probabilistic logic that underlies heredity, with interactive Punnett squares, chi-square testing, and an honest look at where each law breaks down.
concept advanced ~30 min -
№ 06
Running an LLM Locally vs. Using ChatGPT or Claude: A Privacy-First Guide
When you type into ChatGPT, your words travel to a server in another company's data center. For most tasks that's fine — but for private financial documents, medical records, HR files, or legal strategy, it's a dealbreaker. This lesson explains what actually changes when you run a model on your own machine, walks through four concrete scenarios, and gives you an honest picture of where local models win and where cloud still leads.
practical intro ~30 min -
№ 07
Docker for Laravel Developers
A ground-up introduction to Docker through the lens of a Laravel developer — why it replaces php artisan serve, how Docker Compose wires PHP, MySQL, and Redis together, and exactly which commands you need to get a working local stack running today.
tool intro ~30 min -
№ 08
The Harry Potter Timeline Explained
A structured walk through the Harry Potter series — from Harry's birth in 1980 to the Battle of Hogwarts in 1998 — tracing how J.K. Rowling built a seven-year school narrative across two decades of publishing history.
book intro ~15 min -
№ 09
Secure Coding Fundamentals for LAMP Stack Engineers
A hands-on guide to the security moves every LAMP (Linux, Apache, MySQL, PHP) engineer must own — from SQL injection and XSS prevention to password hashing, HTTPS enforcement, and hardened error handling.
skill intro ~30 min -
№ 10
Photoshop Layer Masking: How It Really Works
Layer masks are greyscale images that control pixel-level transparency — white reveals, black hides, grey softens. This lesson builds the core intuition through interactive demos, then teaches you to apply pixel masks, vector masks, and clipping masks in multilayer compositions.
skill intermediate ~30 min -
№ 11
Hue, Saturation & Brightness in Photography
Every color in your photo is described by just three numbers: hue (which color), saturation (how vivid), and brightness (how light). Learn what each one does, how your editing sliders map to them, and what goes wrong when you push too hard.
concept intro ~30 min -
№ 12
Why Affiliation Is So Big in Fashion
Fashion affiliation is not vanity — it is a social signaling system with economic stakes. This lesson unpacks how belonging to a brand tribe transmits status, mediates in-group/out-group dynamics, and why that system is structurally unstable.
concept intermediate ~10 min -
№ 13
Anthropic's Financial Services Reference Repo: Building Production AI for Finance
A guided tour of Anthropic's open-source reference implementation for building Claude-powered financial applications — covering tool use, compliance-aware prompting, RAG document analysis, and why each pattern matters in a regulated industry.
tool intermediate ~12 min -
№ 14
How to Read a Candlestick Chart
Candlestick charts pack four prices into one symbol — Open, High, Low, Close — and let you read a stock's entire session in a glance. This lesson builds the skill from a single candle up through multi-candle patterns.
skill intro ~12 min -
№ 15
Claude Skills: What They Are, When to Use Them, and How to Build Your Own
Claude skills are reusable, structured Markdown files that give a Claude agent a focused capability — like a small, composable function for AI behavior. This lesson explains the mechanism, the trade-offs, and the exact steps to build one from scratch.
tool intermediate ~12 min -
№ 16
Concurrency vs Parallelism: The Actual Difference
Concurrency is about dealing with multiple things at once — managing their structure and interleaving. Parallelism is about doing multiple things at once — physically simultaneous execution. They are independent axes, not synonyms.
concept intermediate ~10 min -
№ 17
Embeddings in Machine Learning
Follow the letter 'A' from raw text all the way into a dense vector — learning what tokens are, why we use them, and how gradient descent bakes semantic meaning into numbers.
concept intermediate ~12 min -
№ 18
What is Entropy?
Entropy is the count of ways a system can be arranged without you noticing. It explains why ice melts, why gas spreads, and why time has a direction — all from one deceptively simple idea.
concept intro ~10 min -
№ 19
Rayleigh Scattering: Why the Sky is Blue
Rayleigh scattering is the mechanism by which small atmospheric molecules deflect short-wavelength (blue) light far more than long-wavelength (red) light — explaining everything from the blue daytime sky to the orange palette of sunset.
concept intermediate ~10 min