You can learn grammar and spelling, but if you don’t practice, then it is only theory.
I know advanced students who can’t really hold a conversation, because they have not practised conversation and to apply what they have learnt.
You can use the conversation classes to get information about travel, language, food, customs, climate, travel, business, work, study or any other practical information.
If you want to practice a specific aspect of English, e.g. asking directions while on a trip, then here is where you’ll practice first with a native English speaker.