NHS period information describes period products as products that absorb or collect menstrual flow. Pads and tampons absorb it; menstrual cups collect it and can be washed and reused. Reusable period underwear is another option.
That difference matters for beginners because using a cup includes learning insertion, seal release, emptying, cleaning and storage. It is normal to treat the first cycle as a learning process rather than a test you must pass immediately.
For younger readers
NHS information about starting periods says young people can prepare by talking with a trusted adult and carrying period supplies. At school, a teacher or school nurse can help.