Know what you know, but don't know what you don't know: During reading a PhD, people realize that their knowledge is very limited, and sometimes they just discover what they don't know. This kind of consciousness makes people modest and stimulates the motivation of seeking knowledge.
Perseverance: It takes a long period of systematic study and research during doctoral studies, and students need perseverance, continuous efforts and perseverance.
Respect and accept diversity: Doctoral students often meet people with different cultures, academic backgrounds and viewpoints. This experience made people understand the importance of diversity and learned to respect and accept different views and understandings.
Research depth and professionalism: During doctoral research, people will study a field or topic in depth and become experts in this field. This kind of professional and in-depth research is very important for becoming an expert and making valuable contributions.
Importance of teamwork: During the period of reading PhD, people not only need to think and study independently, but also need to cooperate with tutors, classmates and other researchers. The experience of teamwork teaches people how to effectively cooperate with others, support each other and listen.
These are just some possible answers, because everyone's blog experience is different, and the most profound truth will vary from person to person.