If you are looking for some quick help in using a large character repertoire in HTML authoring, see the document Using national and special characters in HTML.
Several technical terms related to character sets (e.g. glyph, encoding) can be difficult to understand, due to various confusions and due to having different names in different languages and contexts. The EuroDicAutom online database can be useful: it contains translations and definitions for several technical terms used here.
-> tutorial <-