Skip to content

erroneo.us

Language
Developers
Thinking
Myths
Security
Daily
Play
About

Search all guides⌘K

Home
Security Digest
February 2021

Security Digest archive

February 2021

1 editorial brief across 1 digest days.

Thursday, February 11, 2021
- Check exposure GitLab CVE-2021-22175: 2021 CI Lint SSRF Now in KEV

← January 2021 March 2021 →

Language

Commonly confused words
Common grammar mistakes
Commonly misspelled words
Commonly mispronounced words
Misused idioms and phrases

Developers

HTTP status codes, explained properly
401 Unauthorized vs 403 Forbidden
404 Not Found
429 Too Many Requests
500 Internal Server Error
502 Bad Gateway vs 504 Gateway Timeout (and 503)
418 I'm a teapot
Common JavaScript errors, explained
Common Python errors, explained
Famous software bugs in history

Thinking

Cognitive biases: the predictable ways good minds go wrong
Logical fallacies: how arguments break, with examples

Myths

Science myths that refuse to die
History myths: what really happened
Nutrition myths: what the evidence actually says
Money mistakes and personal-finance myths

Play

Spot the Error
HTTP Status Code Explorer
Bias or Fallacy?
Error Message Decoder
Myth or Fact?

erroneo.us — a reference for getting things right. Updated October 2026.

Security Digest · Error of the Day · About · Editorial standards · Sources & methodology · Corrections · RSS · llms.txt · Sitemap

Part of the allthingsN network of apps, tools and guides · Plan meals with PantryRx

↑ ↑ ↓ ↓ ← → ← → B A