Running epubcheck on your computer
epubcheck is a valuable tool for anyone working with EPUB documents. Many beginners choose to start using it via the online validator at http://threepress.org/document/epub-validate, but it’s a mistake to use that too often. More explicitly:
If you’re making more than 3 EPUBs this year, you must setup epubcheck on your computer
Why setup epubcheck locally? If you [...]