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#tutorial

Tutorial is a general purpose tag. We welcome all types of tutorial - code related or not! It's all about learning, and using tutorials to teach others!

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The complete Kamal 2 deploy.yml for a real Rails app: Postgres, Sidekiq, Redis and backups on one Hetzner box

The complete Kamal 2 deploy.yml for a real Rails app: Postgres, Sidekiq, Redis and backups on one Hetzner box

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5 min read
Building a Self-Correcting AI Agent with Reflection Loops in Python

Building a Self-Correcting AI Agent with Reflection Loops in Python

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5 min read
Excel Dynamic Arrays: FILTER, UNIQUE and SORT in One Formula

Excel Dynamic Arrays: FILTER, UNIQUE and SORT in One Formula

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14 min read
SQL JOINS WITH EXAMPLES OF EACH

SQL JOINS WITH EXAMPLES OF EACH

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2 min read
Excel Drop Down Lists and Data Validation, and the Paste That Removes Them

Excel Drop Down Lists and Data Validation, and the Paste That Removes Them

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14 min read
The 14 errors you will hit deploying Rails with Kamal on Hetzner behind Cloudflare (and the fix for each)

The 14 errors you will hit deploying Rails with Kamal on Hetzner behind Cloudflare (and the fix for each)

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4 min read
MCP Security: Threat Model & Hardening Guide (2026)

MCP Security: Threat Model & Hardening Guide (2026)

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5 min read
Grok Bot is the "iPhone Moment" for AI Agents

Grok Bot is the "iPhone Moment" for AI Agents

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2 min read
Evals and Safety: How to Know If Your AI Agent Actually Works

Evals and Safety: How to Know If Your AI Agent Actually Works

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8 min read
Parte 2: Resolvendo o Desafio Técnico de Backend do PicPay

Parte 2: Resolvendo o Desafio Técnico de Backend do PicPay

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3 min read
How to Create an MCP Server: Tutorial

How to Create an MCP Server: Tutorial

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4 min read
Git Workflow

Git Workflow

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2 min read
I’m testing a faster way to research podcast guests before an interview

I’m testing a faster way to research podcast guests before an interview

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2 min read
Understanding the Git Workflow: Working Directory, Staging, Commit and Push

Understanding the Git Workflow: Working Directory, Staging, Commit and Push

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3 min read
Generate endless Roblox quests with AI (and cache them so it's cheap)

Generate endless Roblox quests with AI (and cache them so it's cheap)

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1 min read
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