"It is a quiet park."
Translation:Это тихий парк.
I'm not a native speaker, but I think that would be closer to "peaceful / calm park"
"Это" means "This is" or "It is". Without it, the sentence is just "A quiet park".
I'm still struggling with парк vs парке, and i assume this is a problem with never studying cases. Any suggested sites?
Look in the forums here, you should find some useful things there. Also the grammar tips on the relevant lessons.
This one here is quite simple - it is the prepositional case which is used with nouns after some prepositions (in, on, to etc.). The most common ending for this case is the addition of an е - as in the case with парке - or that the final vowel of the noun changes to е... For example: место (place) becomes месте in the prepositional.
I'm a learner like you, so I don't know the other changes that occur in this case, and I don't know the exceptions - I just wanted to give you that tip.