The editor is great in Joomla, don’t take this the wrong way, but if you want perfectly formatted content that displays exactly how you want it, there is no replacement for hand coding your articles.
Yes, it is great to be able to write a quick article and click a few buttons in the editor window to align things, but in the long run, you are really just hindering your education. Knowing basic html is going to help you make cleaner, more readable, and more reliable websites. Most articles consist of a lot of: and tags.
Why run the risk of using a editor that may insert all sorts of nonsense like using
as spacers? It’s not semantic, it makes no sense, and it’s invariably going to cause you issues over the long haul.
Get a html cheat cheat, keep it nearby, and go unpublish all your WYSIWYG plugins in Joomla. You will be glad you did.