The advantage of adding a blog to your WordPress website is that you will be able to post content regularly, which does two important things:
1. The more blog content on your website, the more pages that are indexed in Google and this increases the chances of SEO ranking for search phrases that your customers may be searching on Google.
2. Secondly, a blog serves to position you as an expert in your field. For example, if you have blog posts about your industry or products that are interesting to read, this will create trust in the eyes of the buyer and position your company as one that knows what they are talking about, in that particular industry.
3. Adding a blog is also great because when you post fresh content regularly, this is seen as favorable in the eyes of Google, improving your chances of ranking better for SEO.