The content of this book is very difficult.
Please briefly explain the substance of the meeting.
Please check the contents of the contract carefully.
This seminar had rich content and I learned a lot.
I'll explain the content of the meeting later.
The fee varies depending on the content.
The content changed significantly with the revision.
内容 is a general word for the 'contents' of any document, book, or speech, while 文面 refers specifically to the written wording of a letter or document.
internal volume; capacity
beauty of content; substantial beauty