### **5. Create `.gitignore`**
```
# Python
__pycache__/
*.py[cod]
*$py.class
*.so
.Python
build/
dist/
*.egg-info/
.eggs/

# Virtual Environment
netsnoop_env/
venv/
ENV/

# IDE
.vscode/
.idea/

# OS
.DS_Store

# Build artifacts
*.exe
*.spec
*.zip
*.iss

# Logs and data
*.log
*.csv
netsnoop_persistent.txt