How do I convince my parents to get me a steam deck?

So my birthday is coming up and 1 asked my dad that will he buy me a steam deck for my birthday. He said that he would consider my request and tell me his decision. He s currently now thinking about it and is not still convinced that the steam deck is value for money.

Are there any videos that give a good explanation about the steam deck and steam OS for like a complete beginner. Thank you is advance!