"understand the content" is correct and usable in written English. You can use it when you want to convey that someone should comprehend the information that has been presented to them. For example: "Please read the article carefully and try to understand the content.".
It built on a long history of trying to get machines to understand the content and tone of documents.
You must understand those with whom you communicate in order to understand the content of their communication.
Later he added, "The government has not tried their best to make people understand the content of the law".
Yet he was exposed to pop from outside the Caribbean, "because parents couldn't understand the content of what was coming from abroad, so there was no harm".
I could not understand the content of the speech, but it was clear he was not saying what they wanted to hear.
A teacher must deeply understand the content he or she teaches, as well as possess pedagogical knowledge, classroom management techniques and relationship-building skills.
"The PEGI system gives an age rating and a content descriptor to help parents understand the content contained in any game and how appropriate it is for their children to play".
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia