To hide the subcategory word and subcategories on the bottom of the page is done in menus. Go to main menu -> i.e. tech notes (top menu for subs). Once open click on the tab Advanced Options -> Category Options -> Sub category levels chose none. This will hide the bold words at the bottom of the page Sub categories and each sub category. It will still drop-down on the top menu.
When there are more articles then will appear on a page for a given menu the next pages' article titles will appear as links on the bottom of the page. If you do not want this list of articles at the bottom of the page go to the menu item ->advanced options -> blog layout -> number of links = 0. This will remove the list of articles at the bottom of the page. BUT do make sure that pagination is set to show. This will allow the visitor to move from one page of articles to the next under that menu.