Spanish language Q&A Forum

I used "Cuál" thinking that what's on television is a limited, although large, selection.  Like the example: "Cuál es tu flor favorita".

Why is "Qué" used here?

since this website only teaches spanish grammar to C1 does that mean ima have to find another website to teach me the rest of the grammar to C2? im very confused please help me.

No entiendo porque necesitamos usar nos en esta frase

Hello

Can you please share some example sentences for each of the above items?

It will help understand the application better.

Thanks 

When do we not use the articles like "en casa" instead of "en la casa"?

‘We had to play football without kneepads’ - in English  we say shin pads (UK) or shin guards (US). Knee pads are what you use for skating. SpanishDict is telling me shin guards are ‘espinilleras’, but I have no knowledge about about which is correct/if one word may be used in a certain country and another elsewhere etc

Hola. Please help me this, im confused

Te dejé tus llaves. I know it means " I left your keys ", but what's te doing in this sentence? 

Does it change the meaning or grammatically wrong if I don't have "te" in this sentence.

Sincerely thank you