I don't understand some questions when I fly for the first time.

Haha, here's the thing. The plane can't check in until 30 minutes after it takes off, so the official said that 90 minutes in advance will give you plenty of time. I will answer your questions one by one. You can take medicine with you as long as there is no liquid.

2. Notebook can be taken on the plane and can be used after the plane takes off.

3. For domestic flights, each person can check 20 kilograms of luggage for free in economy class. It is said that you can carry 5KG with you, but there is no one who does not exceed it. You can take a small suitcase and a backpack including a computer. Of course, a backpack and a notebook are all right.

4. Time: You can log on to the website of your airline. There is a boarding pass online (you can do it one day in advance). You can get your boarding pass in advance (if you haven't checked your luggage), so you don't have to arrive at the airport so early. You just need to arrive at the airport half an hour in advance and go directly to the boarding gate. It takes time to get the boarding pass temporarily.