How often to blog is important to know because it gives you an idea when to blog and what is the best time is.
I will use my planetvic website as example, but I will try to apply to other website topics also.
You need to blog at least once a week.
if you are creating a professional website, try to check out competitor websites and see how often they post.
How Often to Blog Links
Blog Posting Frequency - How Often Should You Publish New : Learn the requirements of blog posting frequency and how often you should
publish new content on your blog to attract and retain readers.