The content of this book is very difficult.
会議の内容を簡単に説明してください。
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