Writing has many advantages. For example, the more you write, the better you will be at writing. Writing is hard for some people so like mastering other things, writing helps.
Another advantage of writing is it creates better precision when communicating to others about your topic. Also, writing allows your mind to free and allows logic.
Taking notes is an example of writing. Studies show that taking notes by hand is more benificial then taking notes on a computer for example because yu will be able to understand the content better and memorize it better.
Hope this helped. Have a nice rest of your day :)