Knowhow SellerEnglish guides on AI tools, habits and productivity
106 guides written in 2026. They stay online at their original addresses. New writing is in Korean.
Latest guides
How to Be Productive While Unemployed: A Practical System
How to be productive while unemployed or between careers: rebuild the deadlines, review, and stall-detection your job used to provide.
AI Tools Alternative to Claude: Pick a Fallback That Works
Choosing an AI tools alternative to Claude or ChatGPT? Use our fallback criteria: a different vendor, separate auth and quota, and an alert every time it fires.
Free AI Tools vs Paid: What Happens at the Usage Limit
What really happens when free AI tools hit their usage limit: vendor-documented caps, fallback behavior, and a real silent failure that stopped publishing.
Best AI Tools for Writing Long Documents, Refs Intact
Compare the best AI tools for writing long documents without breaking cross-references, backed by a real split-file build workflow and cited data.
How to Be Productive at Work With the 2-Item Rule
A backup scan found 41 abandoned tasks. Capping work-in-progress at 2 items per project fixed it. How to be productive at work, with real numbers.
How to Fix Code Errors with AI for Non-Programmers
A repeatable method non-coders use to fix code errors with AI: paste the raw error, apply one fix, log the result, repeat. No programming knowledge needed.
How to Be Productive: Cap Goals at 2, Not 41 Tasks
How to be productive: cap active goals at two, park the rest as ideas, and clear stalled work faster than a 41-item to-do list ever could.
Why Your Notes Never Get Found—How to Be Productive
Your notes pile up but vanish when you need them. Learn the one-line index rewrite that makes a note system—and how to be productive—finally compound.