What does "future tasks" mean?

You may have encountered tasks labeled “Future.” These are so-called “tasks from the future.” They are based on the theory from up to three upcoming levels. This was done intentionally. If you really want to solve the task now, but you do not have enough knowledge, you will need to do your own research. This is a useful skill for any programmer. Otherwise, if you want to proceed through the course, just put the task aside and return to it later, once you acquire the necessary theoretical knowledge.