For starters, what is the purpose of a blog anyway?
A blog has many purposes such as a company updating customers on progress or new products, a person with something interesting to share like traveling, or a student trying to pass a creative paper…

Blogs are used as a tool to give the same bit of information to a set audience easily and repetitively. For this purpose, they have other good uses as well, such as a portfolio.

So, if your goal is spreading information to a set group of people, how do you make the perfect blog post?
The first three things you should think about is who is your audience, what is the purpose of this blog post, and what do you want the reader to do or feel after reading it. (for example, a blog post aimed at my fellow students about how to make a decent post)
After figuring these out, if your goal is to make people read your post, the most important thing is a good title to draw people in and make the reader interested. One way to do this is to get them hooked with a question that they want the answer to. Like instead of ‘How to Make The Perfect Blog Post’ I put ‘ What Makes The Perfect Blog Post?’ this makes the reader curious, however, both are good titles in my opinion. 
Next is a decent intro, something to draw the audience in and keep them reading.
After all of that is out of the way, comes your main content followed by an optional call to action. The content should also contain a decent summary. With your content, you should add images and graphics to split up the text and make it more enjoyable to read. This graphic should be related and useful to the content.
Lastly, check grammar and spelling. As boring as it sounds it is essential to a decent blog post. I personally use as many tools as I can to help, like Grammarly.

From another angle what shouldn't you do? Here is an interesting video I found:

References:
https://www.salesforce.com/ca/blog/2015/10/anatomy-of-a-blog-post.html
https://blog.hubspot.com/marketing/how-to-write-blog-post-simple-formula-ht