Petr’s AI School is run by Petr Jaroš for colleagues at OnSinch and Shameless, plus friends who asked to join. It started in September 2026.
Format
- One session of about an hour every week, 8 to 12 sessions in total.
- Small homework after each session, because practice is where it clicks.
- A short email between sessions pointing at what is new in the wiki.
- Open discussion afterwards, often with a beer.
Who it is for
Anyone whose work involves a computer. Sales, operations, finance, support, management, design. It is not aimed at programmers; they already have their own material.
What you will take away
By the end of the course you will:
- Know the fundamentals, so no new AI model or product will surprise you. You will recognise the model, the harness and the tools under any coat of paint.
- Be comfortable with the “Code” style of working with AI, an agent with real tools in your own folders. That is where the real power is, and everything else feels simple afterwards.
- Tackle any challenge: bring a task from your job, break it down, and get it done with an agent, start to end.
- Know the differences between models, products and tools well enough to choose the right one for a job, and to switch when a better one arrives. See Chat, Work and Code.
What you need
A laptop you can install software on, a Claude account provided through work, and curiosity. Everything else is covered in the guides.
Mistakes and questions
Found a typo, a broken link or an explanation that did not land? Tell Petr directly, or open an issue on GitHub. Every page in this wiki is a plain text file in that repository, which is itself one of the things you will learn to work with.
What this site counts
This wiki counts page visits, so Petr can see whether it is being used between sessions and which pages are worth writing more of. The counter is GoatCounter, chosen because it collects as little as possible.
The numbers are public. You can see exactly what is recorded about you: petr-ai-school.goatcounter.com.
What it records: which page was opened and its title, when, the page you came from, your screen width, and which browser, operating system and country the request came from.
What it does not record: no cookies, nothing stored in your browser, no ID that follows you around, no IP address kept, and no profile of you as a person. To count a repeat visit as one person rather than two, it holds your IP address in memory for a few hours and never writes it down. The data sits on servers in Finland and Germany.
Two honest notes:
- This class is small. Nothing personal is stored, but if one person reads a page at 23:00 on a Tuesday, that is not hard to guess. Petr reads these numbers as “is anyone using this”, never as a report on individuals.
- If you would rather not be counted, any tracker or content blocker stops it, and nothing on this site breaks when you block it. The browser “do not track” setting will not help you here: almost no site reads it any more and this counter does not either.
License
All content is published under CC BY-SA 4.0. Use it, share it, adapt it, keep the attribution and the same license.