Blogs are very useful for a writer - they showcase your writing skills to the world, and if you're selling your work, you'll find that they get commissions for you painlessly. A “hobby" blog may even get a publication offer for you.
You're A Writer, But That Doesn't Mean That Your Blog Needs To Be About Writing
I've noticed that writers tend to blog about writing, and while this is fine, it's also very restrictive. You can choose whatever subject area you wish for your blog. I encourage you to choose an area about which you're passionate, or in which you're interested, or in any area in which you hope to be published.
For example, let's say you'd like to become a travel writer. Travel writing is very difficult to break into. A blog provides an excellent showcase for your skills. Blog your own travels - even if they're just day trips to tourist venues in your state. If you create this kind of blog, then you can point editors to whom you send article proposals to this blog - it will act as a sample portfolio of your travel writing skills.
Or perhaps you want to develop a copywriting career. This doesn't mean that you need to create a copywriting blog. Blog about business, or finance, or technology - your copywriting skills are on display, and you'll be read by people who can hire you.
You can create as many blogs as you wish, and I encourage you to do so. I've got lots of blogs, and so have many other writers who've found the blogging route to writing gigs. When you want to be published in an area, create a blog for the fast track to success.
You can set up a blog on a platform like Blogger, and the blog will keep generating writing gigs for you for years to come.
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