What Is an AI Agent?
Follow an AI agent through support-ticket triage, run a bounded Python simulation, and learn when a script or workflow is the better choice.
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From the blog
Cache Hits and Misses Explained
Understand cache hits and misses with a runnable Python example, expiration, invalidation, practical use cases and caching trade-offs.
Single-Flight Request Coalescing Explained
Learn how single-flight request coalescing prevents cache stampedes, reduces database queries, and improves Python API performance.
UTM Parameters Explained: How They Work & Examples
What are UTM parameters and how do they work? Learn to create tracking links, measure campaigns in GA4, and avoid common mistakes with examples.
Design Language vs Design System: Explained
Learn the difference between design language and design system with simple examples, comparisons, and real case studies from top companies.
Add MCP Servers in Codex, Claude Code, and Gemini
Learn what MCP (Model Context Protocol) is, why it’s useful, and how to add MCP servers (Notion, Sentry, Context7) in OpenAI Codex, Claude Code, and Gemini CLI.
SkillsHats Visualize
Some things click
when you see them.
Follow an algorithm step by step. Change an input. Watch a system respond. Build an intuition for what the code is doing.
Explore visual lessonsData structures & algorithms · System design
Beginner
Binary search
One comparison. Half the possibilities.
2
5
8
12
mid
16
23
38
Looking for 23: 12 is too small. Keep the right half.
Worst-case time
O(log n)
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