'm developing a Joomla web site now and I understand the breakdown of sections/categories/content but don't understand fully how menus fall into this. I know by default I seem to have 4 menus, mainmenu, othermenu, topmenu, usermenu. It seems whenever I make a new section it asks what menu to attach it to. I have a menu now at the root of my web site thta has the sections I developed. What I'm having trouble with is the categories.
For example, my web site relates to the Mac computer. I have a mainmenu section called apple. I want someone to be able to click on that and if possible have a menu that says macintosh, ipod, iphone, etc. Now when I developed a category called Macintosh I selected mainmenu but apple as it's section. Yet Macintosh shows up on the main screen still instead of being under Apple. What am I doing wrong?