Knowledge base
All articles.
The context behind the tools: short, plain-English explanations for money, technology, AI, health and everything else.
8 articles
Technology
Plain-English articles on software, the internet and the systems shaping daily life.
What end-to-end encryption actually protects
End-to-end encryption keeps messages readable only by the sender and recipient. Learn how the keys work, what metadata still leaks, and where it is misused.
What a VPN does, and what it does not hide
A VPN encrypts traffic between your device and a server. Learn what that protects, what the provider can still see, and when a VPN is actually useful.
How QR codes work, and how to scan them safely
QR codes pack data into a square grid with error correction. Learn how they encode a URL, why some codes fail, and how to check one before you open it.
How password managers work and why they beat reuse
A password manager stores unique passwords in an encrypted vault. Learn how the encryption works, what the master password protects, and how to choose one.
What is cloud computing?
Cloud computing is renting computing resources over the internet. Here is what that means for servers, storage, software, cost and control.
What is an API?
A plain-English guide to endpoints, requests, responses, API keys and rate limits — using the restaurant waiter analogy and a real weather example.
How does AI actually work?
A plain-English guide to machine learning, neural networks and large language models — what they do, how they learn, and where they go wrong.
How the internet works, in one sitting
What happens between typing a web address and seeing a page — DNS, packets, TLS and the journey across networks.
6 articles
Personal Finance
Compound interest, credit, saving and the money decisions that add up over time.
Inflation explained: why your money buys less over time
What inflation measures, how it affects savings, wages and debt, and how to compare nominal returns with real purchasing power.
How to read a paycheck: every line explained
Gross pay, net pay, withholding, FICA and pre-tax deductions can be confusing. Use this line-by-line guide to check your pay stub and spot errors.
Emergency fund basics: how much to save and where to keep it
An emergency fund covers the bills that do not pause when income does. Learn how to size one, where to hold it and how to rebuild it after you use it.
Debt snowball vs avalanche: which payoff method fits?
Compare the two most common debt payoff strategies, see how interest and motivation interact, and choose a plan you can actually finish.
How compound interest works
Why money grows faster when returns earn returns — and why the same effect makes debt expensive. Includes the formula, the Rule of 72 and realistic examples.
Credit scores explained
What US credit scores measure, which behaviours matter most, and the difference between a score, a report and a lender's own decision.
6 articles
AI
Large language models, chatbots and agents explained without the hype or the maths degree.
How AI models are trained, from raw text to a useful assistant
Pretraining, fine-tuning and human feedback explained without the hype. Learn what goes into a modern language model and where its limits come from.
AI prompts that work: a practical checklist
A good prompt states the task, the audience, the constraints and the output format. Learn a repeatable structure and the mistakes that make AI answers vague.
AI hallucinations: why chatbots invent facts
Why language models make things up, which errors are most common, and practical ways to check AI answers before you rely on them.
AI for small business: where it helps and where it does not
A realistic look at AI tools for small businesses, from customer support and marketing to invoicing and operations, with a simple adoption checklist.
ChatGPT vs AI agents: what is the difference?
A chatbot answers a request. An agent can plan, use tools and take multiple steps. Here is where the line blurs — and why autonomy changes the risks.
How large language models work
Tokens, transformers, training, context windows and hallucinations explained without the maths degree.
6 articles
Health & Fitness
Calories, body composition and fitness measures explained with their limits.
Walking for health: a low-cost habit with real benefits
Walking improves cardiovascular fitness, mood and glucose control. Learn how much to walk, how to build the habit and how to estimate the calories burned.
Strength training basics: a simple plan that works
Learn the core movements, how often to train, how to progress and how to recover. A practical beginner guide without the gym-floor guesswork.
Sleep and recovery: what actually helps
Sleep supports memory, mood, immunity and physical recovery. Learn how much you need, why consistency matters and which habits make the biggest difference.
How much protein do you actually need?
Protein needs depend on body weight, activity and goals. Compare common recommendations, learn what a serving looks like, and avoid the extremes.
Calories vs macros: what each number tells you
Calories set the energy budget. Macros describe where that energy comes from. Here is how to use both without overcomplicating food.
BMI limitations: what body mass index can and cannot tell you
BMI is a quick screening ratio, not a diagnosis. Here is what it misses about muscle, fat distribution, age and health risk.
10 articles
Others
Science, documents, food, home and everyday math — the rest of the knowledge base in one place.
Ratios and proportions, without the confusion
How to read a ratio, simplify it, compare part-to-part and part-to-whole, and use proportions to scale recipes, maps and prices.
Protein-rich foods: a practical shopping list
How much protein common foods provide, which options are budget-friendly, and how to build meals around protein without relying on supplements.
OCR explained: how scans become searchable text
Optical character recognition turns pictures of words into editable text. Here is how it works, where it fails and how to get a better result.
How to compress a PDF without wrecking it
Why PDFs get large, which compression methods actually work, and how to shrink a document while keeping the parts that matter.
How much house can I afford?
A practical US framework for the monthly payment, down payment, closing costs and hidden expenses that decide what is actually affordable.
Fractions explained, from pizza to percentages
Numerators, denominators, equivalent fractions, addition, multiplication and the common mistakes that make fractions feel harder than they are.
Meal prep for a US week without the misery
A realistic approach to batch cooking, fridge space, food safety and a sensible weekly food budget.
Why is the sky blue?
The real reason is not the ocean or the ozone layer — it is how air scatters different colours of sunlight.
How vaccines work
A clear guide to immune memory, the main vaccine types, herd immunity and common side effects.
What is quantum computing?
Qubits, superposition, entanglement and the real limits of quantum computers — without the hype.