Drones basically come in different sizes and shapes. On the basis of their weight, drones can be categorized as micro-drones, very small drones, small drones, medium drones, and large drones. A micro-drone typically weighs 100 g or less. Vert small drones on the other hand are relatively heavy when compared with their micro counterparts. They usually weigh between 101 g to 2 kg, which is practically still light to handle. A small drone can be as light as 2.01 kg and as heavy as 25 kg. Although small, they might not very easy to handle. Similarly, medium drones belong to the category of drones that are typically 25.01 kg to 150 kg heavy. Even as you imagine, they are bulky drones and it's quite an effort taking task to manually handle them. Finally, as the name suggests, large drones are the bulkiest of all and weigh more than 150 kg. Imagine the level of proficiency required to handle and fly such drones.
It is always good to remember that attending a professional drone training is a must if you want to enrich your drone flying experience. Such training would help you learn how to handle the different types of drones that have been discussed above. You can even ask your instructor to customize your training in case you want to specialize in a specific category of drone. Besides, if you get certified from a drone training school, your professional standing in the market increases dramatically.