docs: add comprehensive branching strategy

- Defined 9 branch types (main, develop, feature, bugfix, docs, enhancement, release, hotfix, experiment)
- Created branching workflow diagram
- Added naming conventions for all branch types
- Documented merge requirements
- Listed recommended branches to create
- Added branch protection rules

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: hackdartstorm

BRANCHING_STRATEGY.md

@@ -0,0 +1,237 @@
+# 🌿 Git Branching Strategy
+
+## Overview
+
+This document defines the branching strategy for the Python Learning Repository.
+
+---
+
+## 📋 Branch Types
+
+### 1. **main** (Protected)
+- **Purpose:** Production-ready, stable code
+- **Status:** ✅ Exists
+- **Protection:** Always deployable, tested code only
+- **Direct Commits:** ❌ No (PRs only)
+
+### 2. **develop** (Primary Development)
+- **Purpose:** Integration branch for features
+- **Status:** ⚠️ Needs creation
+- **Protection:** Tested code before merging to main
+- **Direct Commits:** ❌ No (PRs required)
+
+### 3. **feature/** (New Features)
+- **Purpose:** Developing new features
+- **Pattern:** `feature/<description>`
+- **Examples:**
+  - `feature/add-docker-support`
+  - `feature/add-validation-utils`
+  - `feature/add-examples-docs`
+
+### 4. **bugfix/** (Bug Fixes)
+- **Purpose:** Fixing bugs from issues
+- **Pattern:** `bugfix/<issue-number>-<description>`
+- **Examples:**
+  - `bugfix/66-guess-number-validation`
+  - `bugfix/67-rps-input-validation`
+  - `bugfix/101-fastapi-datetime`
+
+### 5. **docs/** (Documentation)
+- **Purpose:** Documentation improvements
+- **Pattern:** `docs/<description>`
+- **Examples:**
+  - `docs/add-troubleshooting-guide`
+  - `docs/add-code-examples`
+  - `docs/update-readme`
+
+### 6. **enhancement/** (Improvements)
+- **Purpose:** Code quality improvements
+- **Pattern:** `enhancement/<description>`
+- **Examples:**
+  - `enhancement/add-type-hints`
+  - `enhancement/add-docstrings`
+  - `enhancement/optimize-algorithms`
+
+### 7. **release/** (Release Preparation)
+- **Purpose:** Preparing releases
+- **Pattern:** `release/v<major>.<minor>.<patch>`
+- **Examples:**
+  - `release/v1.0.0`
+  - `release/v1.1.0`
+
+### 8. **hotfix/** (Critical Fixes)
+- **Purpose:** Urgent production fixes
+- **Pattern:** `hotfix/<description>`
+- **Examples:**
+  - `hotfix/security-path-traversal`
+  - `hotfix/critical-data-loss`
+
+### 9. **experiment/** (Learning/Testing)
+- **Purpose:** Experimental features, learning
+- **Pattern:** `experiment/<description>`
+- **Examples:**
+  - `experiment/add-gui-examples`
+  - `experiment/add-async-examples`
+
+---
+
+## 🔄 Branch Workflow
+
+```mermaid
+graph LR
+    main --> develop
+    develop --> feature
+    develop --> bugfix
+    develop --> docs
+    develop --> enhancement
+    feature --> develop
+    bugfix --> develop
+    docs --> develop
+    enhancement --> develop
+    develop --> release
+    release --> main
+    main --> hotfix
+    hotfix --> main
+    hotfix --> develop
+```
+
+---
+
+## 📝 Branch Naming Conventions
+
+| Type | Pattern | Example |
+|------|---------|---------|
+| Feature | `feature/<kebab-case>` | `feature/add-docker-support` |
+| Bugfix | `bugfix/<issue>-<desc>` | `bugfix/66-input-validation` |
+| Documentation | `docs/<kebab-case>` | `docs/add-examples` |
+| Enhancement | `enhancement/<kebab-case>` | `enhancement/type-hints` |
+| Release | `release/v<major>.<minor>` | `release/v1.0.0` |
+| Hotfix | `hotfix/<kebab-case>` | `hotfix/security-fix` |
+| Experiment | `experiment/<kebab-case>` | `experiment/gui-examples` |
+
+---
+
+## 🚀 Creating Branches
+
+### From Issue
+
+```bash
+# For feature from issue #100
+git checkout develop
+git pull origin develop
+git checkout -b feature/100-add-validation-utils
+
+# For bugfix from issue #66
+git checkout develop
+git pull origin develop
+git checkout -b bugfix/66-guess-number-validation
+```
+
+### For Documentation
+
+```bash
+git checkout develop
+git pull origin develop
+git checkout -b docs/add-troubleshooting-guide
+```
+
+---
+
+## ✅ Merge Requirements
+
+### All Branches → develop/main
+
+- [ ] Code compiles without errors
+- [ ] Tests pass (if applicable)
+- [ ] No security vulnerabilities introduced
+- [ ] Documentation updated (if needed)
+- [ ] Issue referenced in commit message
+- [ ] Code reviewed (for PRs)
+
+### Feature Branches
+
+- [ ] Feature complete
+- [ ] Examples added
+- [ ] README updated
+
+### Bugfix Branches
+
+- [ ] Bug reproduced and fixed
+- [ ] Test case added (if possible)
+- [ ] Issue number in commit
+
+### Documentation Branches
+
+- [ ] Spelling/grammar checked
+- [ ] Links verified
+- [ ] Examples tested
+
+---
+
+## 📊 Branch Priority
+
+| Priority | Branch Type | Merge Target |
+|----------|-------------|--------------|
+| 🔴 Critical | hotfix/* | main immediately |
+| 🟡 High | bugfix/* | develop → main |
+| 🟢 Medium | feature/* | develop → main |
+| 🔵 Low | docs/*, enhancement/* | develop → main |
+| ⚪ Experimental | experiment/* | May not merge |
+
+---
+
+## 🎯 Recommended Branches to Create
+
+### Immediate (Week 1)
+
+1. **develop** - Primary development branch
+2. **bugfix/66-guess-number-validation** - Fix input crash
+3. **bugfix/67-rps-input-validation** - Fix RPS crash
+4. **docs/add-troubleshooting-guide** - Add error guide
+
+### Short-term (Week 2-3)
+
+5. **enhancement/add-type-hints** - Add type hints
+6. **enhancement/add-docstrings** - Add documentation
+7. **feature/add-validation-utils** - Create utils module
+8. **feature/add-docker-support** - Docker configuration
+
+### Medium-term (Month 1-2)
+
+9. **feature/add-code-examples** - Examples for all concepts
+10. **feature/add-integration-tests** - Test suite
+11. **release/v1.0.0** - First stable release
+
+### Long-term (Month 3+)
+
+12. **experiment/add-gui-examples** - GUI learning
+13. **experiment/add-async-examples** - Async Python
+14. **feature/add-advanced-llm** - More LLM examples
+
+---
+
+## 📁 Branch Protection Rules
+
+### main
+- [x] Require PR review
+- [ ] Require status checks (tests)
+- [ ] Require up-to-date branch
+- [x] Include administrators
+
+### develop
+- [ ] Require PR review
+- [ ] Require status checks
+- [ ] Allow direct commits from maintainers
+
+---
+
+## 🔗 Related Documents
+
+- [CONTRIBUTING.md](CONTRIBUTING.md)
+- [PROJECT_REVIEW.md](PROJECT_REVIEW.md)
+- [GitHub Issues](https://github.com/hackdartstorm/Python/issues)
+
+---
+
+**Status:** 📋 Strategy defined, branches pending creation
+**Last Updated:** February 19, 2026