if you learn Egyptian dialect you’ll be easily understood by most of other Arabic speakers without having to modify too much, but you might struggle a little to understand North African countries like Tunisia, Algeria and Morocco. plus, Egypt has been the biggest TV and film-producing powerhouse of the middle east for decades and one of the biggest producers of Arab music,so,you'll have access to a large base of dramas, movies and music that' will help you with your learning process. hopefully this helps :)