Looking for C# resources

I am a beginning unity developer and I am looking for materials to learn the game engine. I already know c# throughout, any coding resources I come along with include the c# lessons. I was wondering if you could suggest to me the resources from which I can learn which include only the knowledge about the engine itself and the c# related to the engine only. Books? Official unity courses? Videos?

This is a direct duplicate of this post

It’s best that you don’t repost questions, particularly if someone has already answered the first one…

Please delete this post.