Blog is a great way to increase your audience and generate more traffic and sales for your store. It can help your business, even if the articles in it won't be added too often. Though, you still need to pay attention to the quality and quantity of its content.
The more your blog has posts, the more users get on your site, because it improves website optimization for search engines. It allows you to tell stories that turn visitors into customers. This increases the chances to share information about your store, not only through social media, but also through traditional.
Shopify team is so generous to share their tips on how to start writting and why you need to start your blog:
Besides articles from Shopify blog, there is a full manual how to work with Blog in Shopify Help Center.