HTML editors are programs which allow you to write the code for your website. They differ in their sophistication, ranging from the plain vanilla general purpose Notepad in Windows to commercial software like Adobe Dreamweaver incorporating advanced editing and integration features.
What you see is what you get (WYSIWYG) editors are perhaps mostly commonly used as they require little or even no knowledge of the markup language.
Adobe Dreamweaver is arguably the most used web building software amongst professionals. It supports CSS, JavaScript and server site scripting, etc. and offers many features which are not available in open source software. For example, Dreamweaver has seamless integration with Flash, Adobe's web authoring tool for creating rich interactive digital media content.
Dreamweaver generates generally standards-compliant HTML/XHTML code A significant time-saver of Dreamweaver is its real-time code completion feature for users to select tags and attributes without having to remember the whole names.
Dreamweaver tutorials can be found at:
CBT Cafe
Tutorialized
Amaya
Amaya is World Wide Web Consortium (W3C) 's web editor cum browser. Initially, it started off as a HTML and CSS editor, but today, XML capabilities have been added, and you can now edit XHTML. It is available for all platforms (Windows, Linux and Mac OS) and is free and guaranteed to produce standards-compliant code (well, you would reasonably expect this from an organization that recommends web standards :)).
Nvu
Nvu (pronounced N-view) is an open source WYSIWYG editor by Linspire, Inc. It is suitable for non-technical users as it requires no knowledge of HTML. Other features include ftp integration, tabbed editing and support for forms, tables and templates. It is available for all platforms as well.