You can post as much as you want. Your posts should be meaningful but not for only filling the space. It is a good idea to write 2-3 posts daily but these should be high-quality content. It is better to google the topic of your article and collect the information to give it your own words. It could take a lot of time but it can drag a lot of traffic on your blog as search engines prefer to rank high the quality content.
What is your suggestion about a number of daily posts on a blog?