• What Is JSON and How to Format It?

  JSON is structured text for data interchange. Invalid commas, quotes or brackets cause parse errors.

• UTM Hygiene for Teams

  Agree a lowercase taxonomy for source, medium and campaign. Ban spaces and personal data. Document who owns naming.

• ROAS by Channel: Planning Benchmarks Without False Precision

  Channels do not share one efficient ROAS. Prefer your own history over generic internet tables.

• Profit Margin vs Markup: What’s the Difference?

  Markup is profit as a percentage of cost. Margin is profit as a percentage of revenue. A 50% markup is not a 50% margin.

• How to Calculate Gross Profit Margin

  Gross profit = Revenue − COGS. Gross margin % = Gross profit ÷ Revenue × 100.

• Margin vs Markup Worked Examples

  Markup and margin are related but not interchangeable. Quote the right one when briefing freelancers or finance.

• How to Calculate VAT

  VAT calculators add tax to a net amount or extract tax from a gross amount at a rate you choose for your jurisdiction.

• How to Set a Freelance Hourly Rate

  Divide target income by realistic billable weeks and hours so your rate funds non-billable time.

• How to Compress Images Without Losing Too Much Quality

  Resize to display size, prefer modern formats when allowed, then compress — and keep originals.

• How to Resize Images for the Web

  Serve images close to the largest size you actually display. Upscaling soft sources will not invent detail.