I'm just started to learn about WP. The thing is that I'm going to have a custom view of my posts, involving custom fields. I'm working with Twenty Eleven theme.
The question is what are the files where I can change post appearance? If I insert some coding into the loop (e.g. single.php), it goes before or after the post header and body. I would like to completely restyle the way the post look and include custom fields in this layout.