I want to ask question about Blogger. The Blogger site is https://www.blogger.com/. Here I am not able to format the code while writing my post. Which Stack Exchange site would be suitable to ask this question?
Questions about Blogger are on-topic on Web Applications Stack Exchange . They have a tag for the subject: https://webapps.stackexchange.com/questions/tagged/blogger .
There are a number of questions about formatting on Blogger already, so first check if your question is already answered there.
If not, you can post the question there, providing as much information as is necessary for a good answer.
When asking, be sure to show what you have tried, it can make a lot of difference in the votes that you get!!