JSON Basics for Beginners (and Related Tools)
What JSON is, its syntax rules, common errors, and when to use Base64, URL encoding, hashes, UUIDs and regular expressions.
h/guides · How-to Guides
Step-by-step guides that go with our free tools.
Word Count, Character Limits and Reading Time
How word counters work, how reading time is estimated, ideal lengths for titles and descriptions, and tools that help you edit.
Date Calculations: Days Between Dates and Age
How to count days between dates, calculate exact age, handle leap years and business days, and convert times across zones.
BMI Explained: What It Tells You and What It Doesn’t
How body mass index is calculated, what the categories mean, where BMI falls short, and better measures to use alongside it.
Percentages in Everyday Life: Discounts, Tips & Tax
Practical percentage tricks for shopping, tipping, tax and price changes, plus common mistakes to avoid.
Retirement Planning Basics: How Much Do You Need?
A beginner’s guide to estimating your retirement number, using the 4% guideline, accounting for inflation and closing a savings gap.
Compound Interest Explained: The Snowball Effect
What compound interest is, how the formula works, why starting early matters, and how inflation changes the picture.
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