Newbie seeking any advice

This is my first post.  I appreciate reading the posts and I hope to learn more in time.  My present equipment is amateurish compared to what I read here but I'm just getting started.  I recently purchased a Yamaha R-N803 receiver and a Yamaha CD-C600 5 disc CD player. I have Vandersteen model 1 speakers.  My system sounds very good to me but I would appreciate any general advice as to how I might improve my sound such as room correction, better quality CDs, which streaming service to use, etc.   Thanks in advance, I really like reading the posts and hope to learn more as I go.  Doug Hess, Newtown Square, Pa.