Answer:
The hardest part of being a teenager is now is the lack of independency and ability to make your own choices, and also peer pressure, which would make you want to meet up with standards and hobbies.
The best part of being a teenager is that you don't have to worry about your next meal. Everything is provided for you, hence you have very little or no responsibility at all. This is the time when you can make mistakes and nobody judges you for it.
My advise to a younger sibling would be to enjoy her teenage age, make friends, enjoy life, make mistakes, learn from the mistakes, and most especially, never allow peer pressure to rule you.
Step-by-step explanation: