Hi @novaamalia
I talked about the function of the keys in the post, I summarized the whole function while discussing about both keys.

Here is the function of the public key from the post

The public key just like the name implies is a kind of key that can be made public.
The public can be likened to a users wallet address,this is where a users receive cryptocurrencies into their account.
This implies that without the public key,a user cannot receive any cryptocurrency into their account.

And here is one of the functions of the private key from the post.

The private key is a long string of alphanumeric characters that serve as a password or user ID in order to access the asset or data on the blockchain.
Without the private keys,funds in an account cannot be tampered with and once the private key is misplaced,all the fund is gone for forever.

I hope you understand how these two keys work now.

Thank you for interacting with my post,I really do appreciate.