Visit each position once and learn how a loop walks through an array.
Understand the idea
Traversal means visiting every box in order. We keep one index, use the value at that index, and move right until there are no boxes left.
Imagine checking every locker in a hallway from left to right. The locker number is the index; what is inside is the value.
What comes after foundations
Every lesson follows the same rhythm: understand, plan, reason, predict, and then write the code yourself.
Arrays, strings, and Big O without the scary math.
Sorting, searching, two pointers, and sliding windows.
Linked lists, stacks, queues, trees, and graphs.
Recursion, greedy thinking, and dynamic programming.
Understand first
Plan in pseudocode
Predict each step
Write it yourself