How to Format HTML So You Can Actually Read It
Learn how to format HTML with consistent indentation, one tag per line, and clear structure, plus a worked example and when to minify for production.
How to Validate JSON Before You Paste It Into Code
How to validate JSON before you paste it into code. Check brackets, quotes and commas, read error messages, and see a worked example with {“name”:”Asha”}.
What Is an API in Plain English
What is an API in plain English? The waiter analogy, request and response, a worked weather example, API keys, and rate limits explained simply.
What Is a Barcode and How Does It Work
What is a barcode and how does it work? Learn UPC and EAN numbers, how scanners read lines, a worked shop example, and why a barcode is not a serial or security proof.
How to Make a QR Code for Your Business Card
Learn how to make a QR code for your business card with name, phone and website. Includes a worked example, static vs dynamic codes, and a test-before-printing checklist.
How to Calculate the Days Between Two Dates
Learn how to calculate the days between two dates: inclusive vs exclusive counting, worked example 1 Jan to 31 Jan, leap years, and timezones.
How to Convert Images to WebP Without Losing Quality
Learn how to convert images to WebP without losing quality, using quality 80-85, a worked example, and a fallback for older browsers.
How to Crop a Photo for Instagram Without Losing the Subject
Learn to crop a photo for Instagram without losing the subject, using square, portrait, and landscape sizes while keeping faces in frame.
How to Calculate Futures Profit and Loss Before You Trade
Learn how to calculate futures gross profit and loss before you trade: tick size, tick value, and a worked example buying 1 contract at 100 and selling at 105.
How to Convert PDF to HTML (and What Gets Lost)
Learn how to convert PDF to HTML, what gets lost in text, layout, tables and fonts, why scanned PDFs need OCR, and how to check it in a browser.