Merge pull request #19 from wendev27/resources-added-phase-1-2-3-cheat-sheets

docs(resources): add learning cheat sheets and security guidelines

Author: wendev27

labs/networking/reverse-proxy-lab/README.md

@@ -0,0 +1,7 @@
+FROM node:24
+
+WORKDIR /app
+
+COPY app.js .
+
+CMD ["node", "app.js"]

labs/networking/reverse-proxy-lab/backend/Dockerfile

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+const http = require('http');
+
+const server = http.createServer((req, res) => {
+  res.end('Hello from the backend API 🔥');
+});
+
+server.listen(4000, () => {
+  console.log('Backend running on port 4000');
+});

labs/networking/reverse-proxy-lab/backend/app.js

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+services:
+  frontend:
+    image: nginx
+    volumes:
+      - ./frontend:/usr/share/nginx/html
+
+  backend:
+    build: ./backend
+
+  nginx:
+    image: nginx
+    ports:
+      - '8080:80'
+    volumes:
+      - ./nginx.conf:/etc/nginx/conf.d/default.conf
+    depends_on:
+      - frontend
+      - backend

labs/networking/reverse-proxy-lab/compose.yaml

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+<h1>Welcome to WenDev Reverse Proxy Lab 🚀</h1>

labs/networking/reverse-proxy-lab/frontend/index.html

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+📦 Phase 1 — Foundations Cheat Sheet
+
+resources/phase-1-foundations-cheatsheet.md
+
+🧠 Phase 1: Foundations
+Linux
+pwd
+ls
+cd
+mkdir
+rm
+cp
+mv
+cat
+bat
+find
+fd
+Package Management
+Debian / Ubuntu
+sudo apt update
+sudo apt upgrade
+sudo apt install nginx
+sudo apt remove nginx
+Git
+Create repository
+git init
+Save changes
+git add .
+git commit -m "feat: message"
+Push changes
+git push origin main
+Branches
+git checkout -b feature/auth
+git switch main
+git merge feature/auth
+Networking basics
+Application
+↓
+Port
+↓
+IP Address
+↓
+Internet
+
+Common ports:
+
+Service Port
+HTTP 80
+HTTPS 443
+Node.js 3000
+Express 4000
+PostgreSQL 5432
+MongoDB 27017
+Security basics
+Never commit secrets.
+Use environment variables.
+Hash passwords.
+Validate input.
+Follow OWASP.

labs/networking/reverse-proxy-lab/nginx.conf

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+🐳 Phase 2 — Containerization Cheat Sheet
+
+resources/phase-2-containerization-cheatsheet.md
+
+🐳 Phase 2: Docker
+Build image
+docker build -t my-app .
+List images
+docker images
+Run container
+docker run my-app
+Run with ports
+docker run -p 8080:3000 my-app
+
+Meaning:
+
+Host:8080 → Container:3000
+Running containers
+docker ps
+Stop container
+docker stop <container-id>
+Remove container
+docker rm <container-id>
+Remove image
+docker rmi my-app
+Dockerfile
+FROM node:24
+
+WORKDIR /app
+
+COPY . .
+
+RUN npm install
+
+CMD ["npm", "start"]
+Docker Compose
+services:
+
+frontend:
+build: ./frontend
+
+backend:
+build: ./backend
+
+database:
+image: postgres
+Container networking
+Browser
+
+↓
+
+Host port (8080)
+
+↓
+
+Container port (3000)
+
+↓
+
+Application
+Mental model
+One app
+
+❌ One giant server
+
+✅ Multiple containers
+
+Frontend
+Backend
+Database
+Redis
+Nginx
+
+docker logs <container-id>
+
+docker exec -it <container-id> bash
+
+docker inspect <container-id>
+
+docker network ls
+
+docker network inspect <network-name>
+
+docker compose up --build
+
+docker compose down

resources/phase-1-cheatsheet.md

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+🚀 Phase 3 — CI/CD Cheat Sheet
+
+resources/phase-3-cicd-cheatsheet.md
+
+🚀 Phase 3: CI/CD
+Pipeline flow
+Developer pushes code
+
+        ↓
+
+GitHub Actions
+
+        ↓
+
+Run tests
+
+        ↓
+
+Build application
+
+        ↓
+
+Build Docker image
+
+        ↓
+
+Push image to Docker Hub
+
+        ↓
+
+Deploy
+GitHub Actions structure
+.github/
+
+└── workflows/
+
+    └── hello.yaml
+
+Basic workflow
+name: Node CI
+
+on: push
+
+jobs:
+
+test:
+
+    runs-on: ubuntu-latest
+
+    steps:
+
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+
+      - run: npm install
+
+      - run: npm test
+
+Build Docker image
+
+- name: Build Docker image
+
+  run: |
+  docker build -t my-app .
+  Login to Docker Hub
+
+- name: Login to Docker Hub
+
+  uses: docker/login-action@v3
+
+  with:
+  username: ${{ secrets.DOCKER_USERNAME }}
+  password: ${{ secrets.DOCKER_TOKEN }}
+  Push image
+
+- name: Push image
+
+  run: |
+  docker tag my-app username/my-app
+  docker push username/my-app
+  GitHub Secrets
+
+Store:
+
+✅ Docker token
+
+✅ API keys
+
+✅ Supabase keys
+
+✅ MongoDB URI
+
+✅ AWS credentials
+
+❌ Never commit secrets into Git.
+
+CI vs CD
+CI (Continuous Integration)
+Push code
+
+→ Test
+
+→ Build
+
+→ Verify
+CD (Continuous Deployment)
+Push code
+
+→ Test
+
+→ Build
+
+→ Deploy automatically
+🧠 Biggest lesson from Phases 1–3
+Code alone is not enough.
+
+A real system needs:
+
+Code
+
+- Git
+- Linux
+- Containers
+- Pipelines
+- Deployment
+
+# avoid showing
+
+pwd
+ls
+tree .
+docker ps
+docker images
+docker network ls
+docker compose ps
+git status
+git log

resources/phase-2-cheatsheet.md

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+🔐 Security Sharing Guidelines
+✅ Usually safe to share
+pwd
+ls
+tree .
+docker ps
+docker images
+docker network ls
+docker compose ps
+git status
+git log
+
+Examples:
+
+Docker containers
+Docker images
+Port mappings
+CI/CD screenshots
+Git history
+Project structure
+⚠️ Review before sharing
+ls -la ~
+tree ~
+find ~
+
+These may expose:
+
+~/.ssh
+~/.aws
+~/.config
+~/.git-credentials
+.env
+❌ Never share
+cat ~/.ssh/\*
+cat ~/.git-credentials
+cat .env
+env
+printenv
+
+Never expose:
+
+API keys
+JWT secrets
+MongoDB URIs
+Supabase keys
+AWS credentials
+Docker tokens
+SSH private keys