What is Tree Diagram Sentence Syntax?
Well, if we see the definition of "syntax" we can realize that is: "The study of the rules governing the way words are combined to form phrases and sentences in a language."
That's why tree diagrams have a huge importance here, because with they we can separate a simple sentence and see easily their components, as you can see in the following image:
S: SentenceNP: Noun phraseD: DeterminerN: NoundVP: Verb phraseV: Verb
The tree diagram above is for beginners, it is one of the easier you could make.
Here are a couple of videos that will help you to understand more about the topic: