My Father's Hobbies

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Okay, I actually got it now.
Classes can be used more often and are symbolized by the .
IDs are used only once for an element using a #
The selector puts the right style to the right element; both classes and IDs are selectors
A child is anything embedded; a div within a div, etc.
Box models are separated by divs and are chunks of stuff you can float around.
Cascading refers to the order the browser listens to the rules. You can start with general rules and make exceptions and specifications later on that will override the more general rules.
Example: body{font-size:4em;} .text{font-size:2em;} the latter will rule out the former.