When you are new here, you should read and think extensively in the first year. Learning without thinking is useless, thinking without learning is dangerous. It may appear that all the documents you read are a pile of shit, and later you will taste something different. Don't be discouraged if you don't know anything in the literature. Maybe it's not your problem, but the author's problem. He/she may not have made it clear at all.

If a great authority tells you that you will get nothing because you didn't go to class and didn't get the data, please tell him/her bravely and you will get results. If they are still stubborn, say goodbye to him or her. Only you know the meaning of your work best. To hell with him.

At this stage, people will feel pain and depression, and they will be haggard for Iraq. But God won't close one door, he will open another. You need to think calmly and keep asking yourself: What the hell am I doing here now? Calm down. This stage is very important for your personal career development and for opening up new ideas. At this point, you must consider what can constitute an important scientific problem. This decision must be made by yourself for two reasons: first, if the question you are studying is given to you by others, you will feel that the question was asked by others, not by yourself, so you will not defend yourself or fight for it until you get a beautiful result. Second, your research work during your doctoral period will affect your future development. You must decide which field you want to devote yourself to in the future. Choosing your own research direction carefully is also very important for the development of science. Maybe you can open a whole new world in this direction. Remember: what's the point of starting to collect data if you don't know why you want to do a certain research at all? That's doing nothing.