"I want to go to the bus stop."
Translation:Ich will zur Bushaltestelle.
It's not a mistake - it would commonly be said this way.
A grammatically-complete sentence would be Ich will zur Bushaltestelle kommen. This just means that you want to get there, without saying how (walking? driving? etc.). Since it's not really important to say how you're getting there, you can actually leave the full verb off the end and the meaning is still clear.
This can also be used in some other contexts with modal verbs. It can be slightly more colloquial than using a full sentence, but is used quite commonly, hence Duo teaching it.
Mama, ich will ein Eis (haben/essen)! = "Mum, I want (to have) an icecream!"
Am Montag muss ich nach Berlin (fahren/fliegen) = "On Monday I need to go(/drive/fly) to Berlin"
Er kann Deutsch (sprechen/verstehen/schreiben) = "He knows (how to speak/understand/write) German"
You are too polite. Are you ready for a moment of levity? Here it goes: The Emperor Charles V was a man of many languages, which he spoke with equal fluency. One day, one of his Chamberlains asked him which language he preferred over the others. The answer was: "It depends on the circumstances. I speak Spanish to a Gentleman, French to a Diplomat, Italian to a Lady, German to my horse"
Oh man, if you can find a rule to determine German noun gender, you will revolutionize the German language and make learning 1,000% easier.
Unfortunately, there is no way to determine a noun's gender other than learning the noun with its article (der, die, das) right from the start. And, yes, it's still difficult. But, there are a few rules that can help.
Here, check out this little video and take notes: https://www.youtube.com/watch?v=fYZP95y2mgM
I've also tried a few apps that help you learn articles in various ways. Ultimately, though, it's all through your own memory skills.
Hope that helps a little. Good luck learning the language. Cheers!