The length of your trip will determine how much luggage you need. You will only need to bring hand luggage if you're traveling by plane. This is typically less than 20kg. If you are traveling by plane, you only need hand baggage, usually less than 20kg.
An airport form with information regarding your flight will be handed to you upon arrival. This form will ask for information such as your baggage weight and if you require assistance to check them in.
You should always check this before leaving home. If you don’t check it, you might end up waiting hours for everyone else to do so.
Because you never know what could happen, it is better to travel light. For example, if your bag gets lost, you won't have anything to wear.