PSD:
The .PSD (Photoshop Document), Photoshop's native format, stores an image with support for most imaging options available in Photoshop. These include layers with masks, color spaces, ICC profiles, transparency, text, alpha channels and spot colors, clipping paths, and duotone settings. Web Designers First make the layout of website using Adobe Photoshop and render the image in .PSD Format, This is then shown to clients or saved for future work. A .PSD file can be sliced into HTML/CSS/XHTML Using Slice Tool from Photoshop workspace.
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HTML:
HTML, which stands for HyperText Markup Language, is the predominant markup language for web pages. It is written in the form of HTML elements consisting of "tags" surrounded by angle brackets within the web page content. It is the building blocks of all basic websites.
It allows images and objects to be embedded and can be used to create interactive forms. Since the addition of CSS in websites by W3C, HTML is nowadays used only to write content inside websites. Designing is only done with CSS.
You can learn HTML(the easiest language of website dev) using W3S [ Register or Signin to view external links. ]

CSS:
Cascading Style Sheets (CSS) is a style sheet language used to describe the presentation semantics (the look and formatting) of a document written in a markup language. Its most common application is to style web pages written in HTML and XHTML, but the language can also be applied to any kind of XML document. You can design only one CSS and apply to all pages of a single website. CSS is used for alignment and designing of websites. You can call CSS in HTML using <link href> command.
You can easily learn CSS using W3S [ Register or Signin to view external links. ]

FLASH:
Flash Video has been a popular choice for websites due to the large installed user base and programmability of Flash. Flash websites usually employ cookies and are aka memory whores. A good designer will always mix flash with his html/xml instead of mixing html/xml into flash. Flash is usually used for Website Intros or in separate embed tags. Its main reason is to make website look more appealing.
Best way to learn flash IMO is [ Register or Signin to view external links. ]

3d Cuber:
This was a really neat adventure into programming. The cube is usually made of 12 triangles in three-space. This is can be used to make a website more appealing without introducing .swf(flash) into it.
You can try this one of kind thing [ Register or Signin to view external links. ]

JavaScript:
Many people confuse JavaScript with Sun's Java. No they're to different languages with former being hard as hell. Websites use JavaScript to identify stuff on the browser to validate info like Forms, Registrations et cetera. JavaScript is also considered client side cause it does not interfere with server. Usual pop-ups from a website are actually JavaScript. JavaScript is primarily used in the form of client-side JavaScript, implemented as part of a web browser in order to provide enhanced user interfaces and dynamic websites. However, its use in applications outside web pages is also significant.
W3S is having a detailed lesson guide [ Register or Signin to view external links. ]


PHP:
is a Hypertext Preprocessor is a widely used, general-purpose scripting language that was originally designed for web development to produce dynamic web pages. For this purpose, PHP code is embedded into the HTML source document and interpreted by a web server with a PHP processor module, which generates the web page document. As a general-purpose programming language, PHP code is processed by an interpreter application in command-line mode performing desired operating system operations and producing program output on its standard output channel. It may also function as a graphical application. PHP is aka Personal Home Pages.
You can learn how to make dynamic webpages [ Register or Signin to view external links. ]

ASP:
ASP is Microsoft's counterpart of PHP. Active Server Pages (ASP), also known as Classic ASP or ASP Classic, was Microsoft's first server-side script-engine for dynamically-generated web pages. Pages with the .aspx extension use compiled ASP.NET (based on Microsoft's .NET Framework).
Some serving hosts don't allow PHP(in rare cases) so you must learn basics of ASP [ Register or Signin to view external links. ]

SQL:
Referred to as Structured Query Language, SQL(ite) is used to manage databases of websites, SQL is an ANSI (American National Standards Institute) standard and can access and manipulate databases without manual update. SQL is way better than its other counterpart data management Languages.
You can learn SQL using W3S [ Register or Signin to view external links. ]


Perl/Python
Perl is a high-level, general-purpose, interpreted, dynamic programming language. Perl was originally developed as a general-purpose Unix scripting language to make report processing easier. Since then, it has undergone many changes and revisions and become widely popular amongst programmers. Larry Wall continues to oversee development of the core language, and its upcoming version, Perl 6. You can learn more [ Register or Signin to view external links. ]

Python on other hand is a general-purpose high-level programming language whose design philosophy emphasizes code readability. Python aims to combine "remarkable power with very clear syntax", and its standard library is large and comprehensive. Its use of indentation for block delimiters is unusual among popular programming languages. To learn basics you can try [ Register or Signin to view external links. ]

.NET Mobile:
A website without it's mobile version sounds dumb! Different mobile devices support different programming languages. Some support WAP and WML, some support HTML or a limited version of HTML, and some support both or a different language. To support all types of mobile devices, developers must create one different application for each language. With .NET Mobile, Microsoft has introduced a new platform for developing mobile applications. This language is about how to develop applications with an extension to the .NET Framework, called the Microsoft Mobile Internet Toolkit (MMIT) or simply .NET Mobile.
You can learn it using W3S [ Register or Signin to view external links. ]

World-Wide Web (the Web, WWW, W3:( a client-server information system that uses the Internet to access computers containing millions of hypertext documents
Web page: a single hypertext document written in HTML--Hypertext Markup Language
Web site: a collection of linked Web pages on a Web server
Home Page: the first point of entry to a Web site; help is often available there. See [ Register or Signin to view external links. ] , for example
Web client: the computer and software you use to access Web pages
Web server: the computer and software that you contact on the Internet to access a Web site
Web browser: the client software you use to find and display Web pages
Web search engine: Software that allows searching of the content of Internet sites. Web Search engines work much like the searching software in the Cornell Library Catalog. See the Internet Search page.
hypertext: documents containing embedded links (hyperlinks) to other documents or other parts of the same document
HTML: Hypertext Markup Language, the rules for formatting a Web page so that a Web browser displays the page properly
URL: Uniform Resource Locator, the address of a document on the World Wide Web. Browsers allow you to enter a known address of a Web server or a specific document within that server. Addresses begin with http://, ftp://, gopher://, WAIS://, file://
protocols: sets of communication rules that allow clients and servers to communicate accurately with each other
HTTP: Hypertext Transfer Protocol, the rules that govern the transmission of Web documents from one computer to another via the Internet
SLIP: Serial Line Internet Protocol, allows Internet use via a telephone connection
Netscape: a browser from the Netscape Corp., originally based on NCSA Mosiac
Internet Explorer: a browser developed by Microsoft
MacWeb, WinWeb: browsers for Macintosh and Windows that have low memory requirements and are suitable for older computers
Lynx: a text-only browser
JPEG, GIF: files that process and display data as visual images on Web pages
NCSA: National Center for Supercomputing Applications at the University of Illinois, developers of Mosaic browsing software
CERN: Swiss research center (European Laboratory for Particle Physics) that originally developed the World Wide Web as a tool for scientific collaboration