It might not be quite appropriate for me to post this thread here but I'm studying digital circuit and I'm pretty confused with some terminologies like VDD, VCC and all those abbreviations. Where can I get help? Thank you very much!
In the first instance, you need a Glossary - it's like a dictionary with an alphabetical list of terms or words used in a particular area or subject.
Glossary of Terms - Tyco Electronics
for a start
and then Google 'digital circuitry' for more sites.