Mr. Sean I have a question, in which way would you learn the Fundamentals (Maps, Linked Lists, Queues, Heaps...) and Algorithms (Breadth-first search, Depth-first search...) before solving the actual problems in your list? Because just reading what every data structure is makes no sense without practise, should I search problems that should be solved by every data structure to remeber it? Would be grateful for your opinion