French language Q&A Forum

I asked about this previously and I am still confused.

I did a quiz before and it asked how you would ask "what is this" or something to that effect. And it didn't accept "quelle est..." as the correct answer.

The answer I had received is that quelle needs to be followed by a noun. However, previously, my French teachers would say questions like "Quelle est la date?", so I was very confused. Is that phrase incorrect?

Furthermore, I was doing another quiz and got this question:

Quel est le nom ___ restaurant ?

And I was confused why you could ask "what is the name of the restaurant" and use "quel est" and not "qu'est-ce que c'est" or "c'est quoi".

Basically, I'm not understanding if/when you can use "quel est.." or "quelle est..".

Thank you!

I thought to "manage to" or "be able to" was "arriver à," "parvenir à" or "réussir à." 

Nevertheless, we've this sentence "Mais j'ai réussi du premier coup," featuring "réussir de" + le coup. Is that correct?