Arrays have a problem: you must decide their size before your program runs. If you need to store user input, track game scores, or build a shopping cart, you can't predict how many items you'll need.
I'll show you vectors, C++'s solution to dynamic sizing. They grow and shrink automatically as you add or remove data. No memory management, no fixed limits. You'll learn to create, modify, and iterate over vectors.
By the end, you'll handle collections of data that change size while your program runs.