1. what is last, bid and ask in ask price when selling bitcoin?
2. I want to sell 1 BTC to dollars at $12450/the highest value BTC touches during that day, without limits. What should I do?
3. I want to sell 1 BTC to dollars using the greater to or equal to $13,000/the highest value BTC touches during that day. What should I add in trigger price and ask price?
To answer all of your questions is very difficult. because it belongs to the domain of knowledge and you need to understand supply and demand.
You can certainly sell it for $ 12450 or $ 13000 or even $ 20,000 if someone wants to buy Bitcoin at that price.
You can place orders and wait until the price of Bitcoin rises, the demand increases.