Lets say that you wanted to write a tutorial about Li Chao Segment tree or how Elegia's mind works but you dont know how to write it or where to even begin. Don't worry because this blog will help you start off and get 4k upvotes(note: specified number of upvotes will only come if you write about Elegia's mind).
The first thing people see about your blog is the title. Unless it is in top(in that case you probably already know how to write a good blog), then people will be clicking on it from Recent Actions. If the blog is a contest announcement, a tutorial, or a blog asking for help on a problem, then keeping the title short and concise will help. A certain level of formality should be held when writing the title because it encases everything that you are writing about. You should, however, include description in your title. Simply saying "I have a question" or something similar to that isn't helpful to anyone.
A good title:
A bad title (sorry 255 I had to call you out on this):
The next thing people will see about the blog is the way that you start writing it — the "hook" as your English teachers once taught you. Normally this should be an overview about what the whole blog will be about in a little bit more detail, and if this part is boring or not clear, people will click off the blog.
The main body of the blog is really up to you. You can take whatever approach when writing a blog about a tutorial — some approaches I have seen are comical (making many jokes in the tutorial), serious (getting straight to the point of the blog) and Elegia (refer to image below). This entire part is up for you and should align with your previous blog writing type.
Elegia please explain
Adding images, code, latex or even simple breaks in the paragraphs of a blog greatly increases reader attention. Most of the contest announcements and even tutorials have images to some extent, and this refocuses the reader to the next section. Images are also helpful to convey messages that will take too long to type and also add a little bit of color to your blog.
Good use of images from a tutorial blog (purplecrayon's)
The conclusion of the blog should wrap up the entirety of the blog in a short few sentences. It should also prompt the reader to think about what you said and not simply forget it.
Thats all there is to Codeforces Blogs. Please consider upvoting if you want to see a grey in top contributors and also friend me because I want to hit exactly 420 friends.