¿Cuál es la diferencia entre learn y learn about ?Puedes dar oraciones como ejemplo.

Sometime saying I want to learn something sounds to direct which may confuse the meaning

Examples:

I want to learn chemistry- This is perfectly normal and has a direct meaning. However, it sounds like you want to learn it to mastery

I want to learn about chemistry- This means the same but this sounds like you only want to some things about chemistry

I am learning the history of the Muromachi period in Japanese history- This is the same, it sounds like you are learning it to learn everything about it. A Japanese history college major may say something like this

I am learning about the history of the Muromachi period in Japanese history- This sounds like I am learning a little bit about this as if someone saw me reading a wikipedia page or watching a youtube video about it. This is more likely here since it is more specific than just learning chemistry.