In my case I write because it forces me to make sure of what I am saying so it involves a deeper research and learning process, plus as you said thinking about the structure of the article, guide, etc. it leaves the structure in your mind so when you try to remember something about that specific topic it can come to your mind in that outline you built.
So my recommendation is to write even if you think no one will read you, write something you want to read and if you can help others in the process that's a nice +1.
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In my case I write because it forces me to make sure of what I am saying so it involves a deeper research and learning process, plus as you said thinking about the structure of the article, guide, etc. it leaves the structure in your mind so when you try to remember something about that specific topic it can come to your mind in that outline you built.
So my recommendation is to write even if you think no one will read you, write something you want to read and if you can help others in the process that's a nice +1.