⚡ Python asyncio Reference
async/await fundamentals, asyncio.gather vs create_task, timeouts, running sync code without blocking, async context managers, aiohttp patterns, Queue producer/consumer, Lock/Semaphore, and the mistakes that silently kill performance.
🔍 Free tool: PyPI Package Health Checker — check aiohttp, aiofiles, and other async packages for EOL status, known CVEs, and latest version.