Ler Tech Notes
LerLer ChanInstructor of AI Agent classes | Programmer since 2010 | Blogging since 2007 | Helping working adults and students build practical AI tools | Exploring ethical AI writing, automation, and education.
| Platform |  | Pricing | Freemium | Publishes | Twice weekly |
|---|---|---|---|---|---|
| Issues | 50 | Founded | 10 months ago | Last Issue | 4 days ago |
| Active | |||||
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lertechnotes.substack.comLatest Issues
AI Will Not Replace Product Managers. It Will Expose the Shallow Ones.
Last month, I watched a product manager use AI to draft a product requirement document — a PRD — in less than half an hour.
The surprising part was not that AI wrote the document quickly.
The surprising part was what happened after that....
AI Did Not Remove Cost. It Changed the Type of Cost.
Many people assume that because AI makes work faster, it should also make everything cheaper.
But in real projects, this is not always true.
When a client asks:
“Can this be done faster?”
The answer may still be:
“Yes, but it will...
Webwright vs Playwright: A Deep Technical Comparison (Not Just Hype)
Deep Technical Comparison: Webwright vs Playwright
Below is a more engineering-focused breakdown based on actual usage patterns.
🔬 Execution Model (How tests actually run)
🧩 Selector & DOM Handling
Example co...
Why Webwright + Claude Code Cut My Testing Token Cost
3 June 2026, I tested Microsoft Webwright on my WordPress plugin project.
My stack:
-
✅ WordPress plugin (real-world, not demo)
-
✅ Claude Code
-
✅ Sonnet 4.6 Medium
And my honest reaction:
Webwright feels significantly sma...
The Zero-Click Extinction: Why AEO is the Only Strategy Left for Brand Survival in 2026
1. Introduction: The Era of the Zero-Click Search
The digital marketing landscape is currently navigating a “Zero-Click Crisis.” For decades, the primary objective of a strategist was to earn a spot in a list of blue links to drive tr...
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Instructor of AI Agent classes | Programmer since 2010 | Blogging since 2007 | Helping working adults and students build practical AI tools | Exploring ethical AI writing, automation, and education.
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