Subject Cataloging Workshop (slides)Slides from Bradley Carrington's 2020 NMLA presentation on Dewey Decimal Classification, Library of Congress Classification and subject headings.
Library of Congress Catalogers Learning Workshop:https://www.loc.gov/catworkshop/ (Free cataloging training materials from the Library of Congress)
Cataloging for Non-Catalogers:https://learn.webjunction.org/course/view.php?id=14 (Web junction is free, but you will need to register and create and account - provides an introduction to cataloging and the importance of cataloging for the beginning cataloger)