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There is a distinction that needs to be drawn here: are you talking about practice that helps you improve your writing, or are you talking about the kind of practice you can put in a CV to help you...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/47349 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/47349 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There is a distinction that needs to be drawn here: are you talking about practice that helps you improve your writing, or are you talking about the kind of practice you can put in a CV to help you get a job in journalism or something similar? If you're looking for something to put on your CV, "I write a diary" is weak. "I write a blog" is stronger, because you can put a link to it. Even if the two are essentially the same thing - the fact that a blog is "published" makes people see it differently. But if you're asking whether your writing is improved by the fact that you write a diary, then yes. Any exercise wherein you express your ideas in writing, improves your writing. School assignments. Blog posts. Diary entries. Letters. Stack Exchange answers. Expressing your ideas clearly, transmitting them in a way that lets them be understood by others - it is a skill. Any form of writing improves it. (Writing of ideas, I should say. Making a shopping list doesn't count.) It is a habit that you have? That's great. You're getting practice through something you enjoy and do anyway, rather than through "dedicated practice". That's actually better, since it wouldn't tire you as much.