There are six main types of classified ads: situation vacant, to-let, sale/purchase of property/vehicles/goods, education institutions, missing persons, and tours/travels. Each type should include specific information. Situation vacant ads should provide details about the organization, position, qualifications, salary, and contact information. To-let ads require accommodation details, rent, location, and contact information. Sale/purchase ads need item description, price, condition, and contact details. Education institution ads give school name, courses, eligibility, facilities, fees, and contact information. Missing person ads provide the description, name, last seen location, reward, and contact details. Finally, tours/travels ads state the travel agency