It is indeed quite common for PhD students to write review articles during their academic journey. Review articles play a significant role in consolidating and synthesizing existing research, making them an excellent opportunity for PhD students to delve into their field while developing a comprehensive understanding of the subject matter. These articles typically serve as valuable resources for fellow researchers and are often published in peer-reviewed journals, which is a significant milestone in a PhD student's career. Writing a review article also allows PhD students to showcase their ability to critically assess and evaluate existing literature, a crucial skill in the academic world.

From my personal experience, I found writing a review article to be an essential exercise in learning how to structure complex information and communicate it clearly. The research process required me to not only summarize findings but also to identify gaps in the current knowledge and propose future research directions. This process has proved to be invaluable in strengthening my understanding of my field and honing my academic writing skills. If you are a PhD student looking to expand your expertise and contribute meaningfully to your academic community, I highly recommend considering review articles as part of your work.

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It depends... I come from Peru, unfortunately there is no culture of writing in the PhD, it is not a requirement... in other words, it will depend on the context and level of the PhD.

In my experience, in a good PhD program you should do a literature review (which, optimally, should be published, but it is not mandatory), to know the gaps of what you propose to investigate. In addition, writing a literature review can be a good starting point for people who have not written papers before.

Yes, it is quite common for PhD students to write review articles, especially in the early stages of their research. Review articles serve several purposes, depending on their discipline.