Hallo,
i'm a beginner bitcoin user 
i want to ask some questions to you old users.
1. As a beginner, what should I do first time?
2. How can i get
BTC?
3. Then, how can I make to redeem the BTC?
thanks for the answers

Greetings

First of all you must find a good and simple bitcoin wallet,that makes transfer easy(such as coinbase,mycelium mobile wallet,electrum and others). How can you get btc? i think that the best way to earn btc for nebwies is trading cryptos and making some easy jobs.
You can redeem the btc by exchange in any valute