When "tengo ganas de" come together, they are translated as a phrase rather than by the word. "tengo ganas de..." translates to "i feel like..."
Much like "yo tengo calor" translates to "I have heat", but it means "I'm feeling hot".
As a rule of thumb, if the sentence doesn't make sense word for word, try to loosen up a bit and translate the sentence's message.
When you start a new lesson, a panel pops up that has a start button you push to begin the lesson. Also on that panel is a key button and a light bulb button. The light bulb button is the one that gives you tips and info regarding that lesson. The key button lets you test out of that lesson and jump to the next level.
My thought is you remembered the concept well, which is the important thing (how exactly your brain processes it in English is u important cf your understanding of the Spanish) but that you know deep down that an algorithm is probably not going to give you credit for that answer!
Not sure if it's the same in Spanish but that is definitely not the same thing in English. Imagine if you were at a friend's house and said 'I feel like drinking some water', odds are they are going to ask if you want some water, because all you've done is said you're thirsty, you haven't asked them for anything.
Meanwhile if you said 'I would like some water' it would be clear that you expect someone to get you water so they wouldn't ask if you want it because that's a redundant question.
Having an idea of the meaning of "ganas de" without remembering translations for it I put "I'm up for drinking something." Any thoughts? (Maybe too colloquial/informal for Duo? Maybe not strong enough for "ganas de", although its pretty similar to "feels like", maybe stonger?)
That's because "tengo ganas de..." specifically means "I feel like..." while "yo gustaría.." specifically means "I would like..."
"Tengo ganas de" is a phase that always means this and is not translated literally. Much like "a que hora".
You are very much so correct about "beber” meaning "too drink". :-)