The Spanish site for Oxford Dictionary is full of great resources!
The Take off in Spanish part has dialogues and a pronunciation guide.
The site provides a key for grammar terms used, and it even takes the time to share interactive activities for practicing grammar etc.
I stumbled onto this site in general because I’m looking for dictionary skills practice and advice for students. It seems like we really need to understand more about using them (particularly to avoid mis-using internet resources as regards our writing and cheating). I made an activity last year that anyone is welcomed to use. Click here: Diccionario skills for that document.