When you start learning a subject which is an extensive one, you want to start with getting its general outline. I'd start with something relatively easy - do you know how many sovereign countries are there in the world? If the answer is no, it can be your starting point. read more
Watch some geographic documentaries, which includes beautiful scenery. From that, you will develop an interest in learning country. You'd better read wiki. it's the easiest way to learn country. More than that, using other country's communication app and meeting with other country's people will make you learn the country well. read more