Add study notes: 22 areas documented by Diego IA

study/php-r-ruby.md

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+# PHP, R, Ruby — Estudo
+
+---
+
+## 🐘 PHP
+
+**Paradigma:** Server-side scripting, web nativo
+**Tutoriais:**
+- Laravel Blog: framework MVC completo
+- Pure PHP Blog: sem frameworks (entender o core)
+- Real Estate: SilverStripe CMS
+- Chat Realtime: Laravel + VueJS + WebSockets
+- Social Network: Laravel completo
+- Multi-tenant Laravel (7 partes): arquitetura SAAS
+
+**Conceitos:** Laravel (Elixir, Blade, Artisan, Eloquent), Composer (packages), Multi-tenancy
+
+---
+
+## 📊 R
+
+**Paradigma:** Estatística, data science
+**Tutoriais:**
+- Shiny Web Apps: dashboards interativos
+- Crypto Trading Bot: automação de trades
+- Association Rule Mining: market basket analysis
+
+**Conceitos:** Data frames, ggplot2, Shiny, dplyr/tidyverse, RMarkdown
+
+**Aplicação MT:** Análise estatística dos editais, dashboards Shiny
+
+---
+
+## 💎 Ruby
+
+**Paradigma:** Elegante, produtivo, OOP puro
+**Tutoriais:**
+- Network Stack: TCP/IP em Ruby (educacional)
+- Build your own Redis (5 partes): protocolo, TCP, concorrência
+- Rebuilding Git: object store, commits, branches
+
+### Ruby on Rails:
+- Rails Tutorial: full stack web app
+- Instagram clone: Rails completo
+- Social Network: Rails + banco
+- DO guide: deploy Rails
+
+**Conceitos:** Convention over Configuration, DRY, MVC, ActiveRecord, gems, Rails ecosystem