core-development

# Core Development Skill

## Quick Reference

| Path | Duration | Entry Point | Exit Point |
|------|----------|-------------|------------|
| **Frontend** | 3-6 mo | HTML/CSS | React/Vue + Testing |
| **Backend** | 6-12 mo | Language | API + DB + Deploy |
| **Full Stack** | 9-15 mo | Frontend | Full app + DevOps |
| **DevOps** | 12-24 mo | Linux | K8s + IaC + CI/CD |

---

## Learning Paths

### Frontend
```
[1] HTML5 + CSS3 (2-3 wk)
 │
 ▼
[2] JavaScript ES6+ (4-6 wk)
 │
 ▼
[3] React 19 / Vue 3 (4-6 wk)
 │
 ▼
[4] State + Testing (2-4 wk)
 │
 ▼
[5] Deploy + CI/CD (1-2 wk)
```

**2025 Stack:** TypeScript + React 19 + Tailwind v4 + Vite + Vitest

---

### Backend
```
[1] Python or JavaScript (4-6 wk)
 │
 ▼
[2] Framework: FastAPI / NestJS (4-6 wk)
 │
 ▼
[3] Database: PostgreSQL (3-4 wk)
 │
 ▼
[4] APIs + Auth (3-4 wk)
 │
 ▼
[5] Testing + Deploy (2-4 wk)
```

**2025 Stack:** Python + FastAPI + PostgreSQL + Redis + Docker

---

### Full Stack
```
[1] Frontend Mastery (3-4 mo)
 │
 ▼
[2] Backend Mastery (4-6 mo)
 │
 ▼
[3] Integration + DevOps (2-4 mo)
```

**2025 Stack:** Next.js 15 + PostgreSQL + Vercel

---

### DevOps
```
[1] Linux + Bash (4-6 wk)
 │
 ▼
[2] Docker (2-3 wk)
 │
 ▼
[3] Kubernetes (6-8 wk)
 │
 ▼
[4] Cloud: AWS/GCP (8-12 wk)
 │
 ▼
[5] Terraform + CI/CD (4-6 wk)
```

**2025 Stack:** Docker + Kubernetes + Terraform + GitHub Actions

---

## Technology Matrix

| Component | Frontend | Backend | Full Stack | DevOps |
|-----------|----------|---------|------------|--------|
| **Language** | TypeScript | Python/JS | TypeScript | Bash/Python |
| **Framework** | React 19 | FastAPI | Next.js 15 | - |
| **Styling** | Tailwind | - | Tailwind | - |
| **Database** | - | PostgreSQL | PostgreSQL | - |
| **Testing** | Vitest | pytest | Playwright | - |
| **Deploy** | Vercel | Docker | Vercel | K8s |

---

## Troubleshooting Decision Tree

```
Which path should I choose?
├─► Like visual/creative work? → Frontend
├─► Prefer logic/algorithms? → Backend
├─► Want to build complete