🌲 Trees
🌲 Trees are everywhere.
📁 File systems 🏢 Organization charts 💻 DOM structure 📂 Menu hierarchies
Once you recognize tree structures, many problems become easier to reason about.
📚 Stack
📚 Stacks aren't just for parentheses problems.
They're behind:
↩️ Browser back button ↶ Undo/Redo 📞 Function calls 🧭 Navigation history
LIFO quietly powers features we use every day.
🧩 Recursion
🧩 I rarely write recursive code at work.
But recursion changed how I think about problems.
✂️ Break a complex problem into smaller ones. 🔄 Solve one piece at a time. 🏗️ Build the final solution.
The mindset is often more valuable than the algorithm.