The first and most important mistakes students commit while preparing for dissertation writing is selecting irrelevant or difficult topic. It is often said that students must choose a topic which they are more passionate about. Although it is the right way to choose the topic, sometimes students might not be capable enough to work on the topic, or they might not have enough knowledge on the topic. So choose an area where there is a significant need for study to solve a problem and also you have enough subject knowledge.
Also choose a topic which has rich content, and enough information is available to establish a theoretical framework for the study. Choose the topic which was studied previously, but which needs further study. This will help to finish the dissertation easily. The topic chosen must have a good amount of information so that we can finish the task before the deadline. Apart from all these, the most important step is choosing the topic early. If the students delays in selecting the right topic, he/she must finally limit their choice of topic. It is also advised to choose a topic which both the student and the advisor are interested in so that their synergies can help in fetching good grades. Take active advice from the guide or mentor throughout the process to be in a better spot.