Ok, it doesn’t feel like a complete answer without context.
You can go to the website “mempool.space” and click on any transaction that has ever been sent on the bitcoin blockchain. It will give you the date and time of the transaction, transaction id number, the amount of Satoshi that we’re sent, the to address, the from address, the uxto and if there is still a balance there, where the change went to etc. so all of this info is public knowledge. 

What we need to keep private are the private keys, and wallet seed phrase. 

Think of the private keys as a long string of numbers and or characters that is in a computer readable format. Humans can read it but it is so many digits that it would be too easy to make a mistake when reading it and or transposing it. 
In contrast, your wallet seed phrase which is human readable and shorter in length. Think of it as common words that we use daily. 

Private keys and wallet seed phrase have the same function just different names and methods to access the same information.