Ask HN: What did you learn last month? (July 2026)

15 points by bhu1st ↗ HN
What did you learn recently? What concept finally "clicked" for you?

17 comments

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Current AI can hack servers better than most hackers.
I used Python webview to make some little desktop utilities.

Most modern frameworks feel like they have so much bloat and overhead. I wanted to make some simple things is a simple way, and it seemed like a good solution for that.

Thank You for this. I am also making some simple things and have been using bash with a CLI as the UI, but asking folks to use a CLI in this day and age is a bit much.

This idea seems like what I have been looking for.

Quantum Mechanics (ongoing), Sturm-Lioville theory, Special Relativity (ongoing), Tensors (going towards General Relativity)

What finally clicked: Hermitian matrix, self-adjoint operators, quantum operators for energy and momentum, the Metric (for modeling spacetime curvature), etc.

What's the story of the Hermitian matrix and self adjoint operators?
I have been learning langchain or langgraph for making good Agentic AI workflows.
While reading the Jelly-UI source I learned that you can use slot tags to effectively punch holes in the shadowdom on a web component. The elements passed in as component children can be assigned to a slot[1] within the component's shadowdom, and the external styles on them continue untouched.

1. https://github.com/jelly-org/ui/blob/main/src/components/res...

I had not "vibe-coded" at all. I decided to learn I would build a game I would be passionate about. I jumped in head first with Claude Code and am absolutely blown away with the power and ease of use. I went from just an idea to a v1 prototype to a staging environment for 2.0 to production 2.0 with even more features than I initially planned in less than a month. The lesson is, if you're brand new, like I was, just jump in and use the tools for something you care about. You will quickly learn more than you thought possible and have fun at the same time.
I spent some time learning about healthspan, how to stay healthy as you age. It is something which I have had an interest in for a long time. I am focusing on staying ten years ahead with my health.
Learned the basics of IBM Z mainframe stuff, and got a "credly" thing on my LinkedIn. IBM actually said congrats.

Just started their COBOL course now.

That finishing a website and getting Google to index it are two completely different projects. I shipped a few hundred pages, all technically clean (now), and most of them have been sitting in "Discovered, currently not indexed" status MY AI coding assistant tells me a new domain with no external links just doesn't get crawl priority, and no amount of extra on-site work will change that.

Two specific mistakes I did fix along the way: my landing page force redirected visitors to their browser language, which can hide the other language versions from crawlers. Google's own docs say offer, don't force. And my internal links pointed at page.html while my sitemap said /page, so Google was discovering every page at one address and being told the real one was another. This could have also contributed to the limbo my website is in (although Gemini says that that doesn't happen). Fingers crossed

I started learning how cars work through a website called howcarswork.com It seems though the project was canceled halfway through. does anyone know if he ever plans on finishing it?