It depends on where do you want to travel, and if you want to be able to speak to everybody in Spain and some countries in South America. As they said, Catalan is a separate language from Spanish. It sounds more or less similar to it, but people not accustomed to hear it can take longer to start understanding it. It's spoken mainly in Cataluña, but also in many other places, both inside and outside Spain. Inside Spain you can hear Catalan in Valencia (really, they speak a variant of Catalan there), some places in Murcia, Baleares and Aragón, and outside Spain it's spoken in Andorra, some regions in Italy and France. Catalan is really more similar to French than to Spanish in its vocabulary, but its pronunciation is nearer to the Spanish one. On the other side, Spanish is understood in all regions in Spain, in most South American countries, and many many other places, being the second most natively spoken language in the world, so certainly it's worth learning Spanish. Being spoken in so many regions, you can be sure there are many variants of Spanish out there. Spain's Spanish can be a good reference, but South America countries can use a very different vocabulary in many informal situations. I hope that helps.

That's not Spanish, that's Catala. It can be translated as "so beautiful, girl... where is that?". The Spanish translation would be "muy guapa, nena... ¿dónde es eso?". Maybe a context would help to give you a more accurate translation.

As they have said to you, 'vaya' here is used to express enfasis. Although it's a form or the verb 'ir' as ypu noted, in this example a more fitting translation would replace 'vaya' with 'qué', becoming 'what' in an exclamative sentence: "¡Vaya película que se perdieron ustedes!" "¡Qué película se perdieron ustedes!" "What a movie you missed!"

Here in Spain we don't use that word at all. You can hear things like 'tío', 'colega' or even 'tronco' from young people or in certain casual circunstances, but never 'wey'.

Aquí en España puedes usar ambos para decir homework. Como te han dicho, 'deberes' son las obligaciones de uno, y 'tareas' son las actividades que uno realiza, que pueden referirse en particular a las del colegio. En el caso de los niños, sus deberes son las tareas del colegio. Here in Spain you can use both of them to say homework. As they said, 'deberes' are one's duties, and 'tareas' are the activities one does, which in particular can refer to school's activities. In the case of children, their duties are school's activities. Por eso aquí usamos las dos palabras. Por ejemplo: Because of that, here we use both words. For example: "You still haven't done you homework, so you won't see that movie" "Aún no has hecho los deberes, así que no verás esa película" "Do you have some homework today?" "¿Tienes tareas (del cole) para hoy?"

I liked that question... I'm from Seville, at the south of Spain. and even here in one single city, you can distinguish two clearly different accents (one with 'ceceo', and the other with 'seseo', both forms very strong). As Ego Ex Deus said, there is no single 'Andalusian' accent, each province has its own variant. I agree with him in liking the accent of people from Cadiz (I think mine is similar to this one). I suppose most people refer to the accent from Cadiz or Seville when talking about Andalusian accent, but the variants from Cordoba or Granada (also provinces in Andalucía), for example, are too different. Also I like accents from Barcelona and Mexico. I find kind of attractive the one from Argentina, too, so strong, or clear, I don't know. Here in Spain, many movies and TV shows are voiced with Vasque or Catalan actors, because their accents are pleasant in some sense, but of course, this is a matter of taste... Hey! I also like Irish accent!

Muy bien. Me ha hecho gracia la pregunta... Cuenta conmigo para practicar de vez en cuando.

As Luis has said, in your question "La cebra, ¿qué colores tiene?" (or better, "¿Qué colores tiene una cebra?" or "¿De qué color es una cebra?") you're asking for the color names, not for a description of a zebra, so the answer is about color names. So, for this form of the question, a propper answer would be "Blanco y negro". You can understand something like "La cebra tiene los colores blanco y negro", where 'blanco' and 'negro' are adjectives for the word 'colores', which has male genre. If you were giving a description of the zebra instead of enumerating a list of color names, then it would be better to use female forms because 'cebra' is a female noun: "¿Qué aspecto tiene una cebra?" - "Es blanca con rayas negras"