How do I build a comprehensive catalog of my Marvel Comics collection for insurance or personal reference?

Several options exist. Dedicated comic book cataloging software like CLZ Comics (clz.com/comics) allows you to track issues, variants, condition, and value. Spreadsheets (Excel, Google Sheets) are a simpler option for smaller collections. Photographing each comic and storing the images digitally is also recommended. Regularly back up your catalog to prevent data loss.