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It is possible to build simple websites using only HTML. Back in the days that was all people had. CSS is worth picking up cos it makes the task of styling your web page a lot easier. Javascript etc. are used for effects such as image rollovers, fancy image maps and some parts of web application development. If all you want is a simple home page then HTML will do it for you, although CSS is definitely worth knowing some amount of.
In answer to 2, the source is already read only in a sense. The browser gets the HTML source from the webserver that holds your site, and displays it as a web page. When the user views the source they can view it, change it and save a copy on their own computer, but they cannot change the copy on your webserver in this way. When anyone else requests the page, they get a fresh copy of the one on the server.
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