Paging & Posting in WordPress discusses key concepts for organizing blog content including:
Posts are the main content items that are displayed in reverse chronological order. Pages are static content like "About" pages. Sticky posts can be used to pin important posts to the top. Tags and categories allow grouping related posts. Widgets add elements to sidebars like calendars and blogrolls. Archives organize posts by date or category. Permalinks are permanent URLs for posts and pages.