The BeerHouse Reading --CSS review

http://library.books24x7.com/book/id_14277/viewer.asp?bookid=14277&chunkid=616591712

Learning take advantage of powerful features such as master pages and themes.
Review CSS:
the dot(.) profix the class --- custom style classes
HTML objects not another explicit class associated with
associate a style class to a HTML object by ID-- by using # prefix
mix the varioubs--.sectiontitle a
{
color: yellow;
}

.sectionbody a
{
color: red;
}