There are three important aspects of a question post at Stack Exchange, and you shouldn't neglect any of them. They are the title, the question body, and the tags.
This is the advertising for your question. This is what people will see in the question list on Stack Exchange, as well as in the search results in web searches such as from Google. The ...
Not only is it permitted, it is actively encouraged.
As the founder of Stack Exchange, Jeff Atwood, said long ago:
I do it all the time! For example, when I ran into a nasty issue with Java exploits in Google Chrome when browsing for images, I documented that on Super User by asking and answering my own question. Now, others can benefit from my ...