How to create strong passwords (and remember them)
What makes a password strong, how long it should be and how to manage passwords without reusing them.
Practical guides
Short, original explanations to get the most out of the tools and understand what they calculate.
How to calculate percentages: discounts, increases and VAT
The four most common percentage operations, with formulas and worked examples.
How to optimize images for the web
Format, dimensions and quality: the right order to cut file size without losing sharpness.
The 8 most common JSON errors and how to fix them
Trailing commas, single quotes, comments, malformed numbers… what each error means and how to fix it.
Time zones and daylight saving: how to get them right
UTC, offsets, daylight saving and timestamps: what you need to schedule meetings and calculate dates without mistakes.
Bytes, bits, MB and MiB: why your drive has “less” space
The difference between decimal and binary units, and between megabits and megabytes, with examples.
How to make a QR code that always scans
Size, contrast, quiet zone, error correction and content types: the checklist before you print a QR code.
Accessible colours: WCAG contrast explained
What 4.5:1, AA and AAA mean, how to check them and how to build a palette everyone can read.