I'm confused as to why this was marked wrong
There's no option to add a question mark and this is the first time I've ever seen this happen. Unless I'm missing something here, this should have been correct.
The question mark isn't actually necessary for written questions in Japanese, anyway; the final particle makes it clear that it is a question. It is downright wrong of Duo to insist on it.
I also wonder if DL's attempts to get the Klingon course to treat certain punctuation characters as letters could perhaps be leaking into other courses and causing bugs like this.
Duolingo doesn't usually assess punctuation when determining if an answer is correct or not. So, I believe you've run into an error that you are not responsible for.
(Japanese is still in beta, so, this stuff is still getting weeded out.)
As Leliel5 mentioned, I recommend using the Report button (if a viable report option is available) and the discussion forum for that particular sentence. :)
YES! I frequently run into this problem and it is upsetting to me. The bug report form is also broken for me for some reason, so I cannot even manually report any of these problems...my only option is to post here in the forums, which feels to me like screaming into the void.
I find it very demoralizing when I see a clear problem with an exercise and am unable to report it.
I really liked the old setup where there was an open-ended "Other" box and it allowed me to type stuff in. It was quick, simple, and easy, and I made heavy use of that box.
Now I can't do anything and I find it extremely aggravating and demoralizing. It's like, I WANT to help DuoLingo improve their system by filing useful reports, and they've taken away my ability to do so.
There's learning a language and then there's learning how to learn languages. The latter generally comes once you learn a language to any degree of proficiency. To get there, you have to have a somewhat strong understanding of basic grammar. Knowing what nouns, verbs, adjectives, adverbs, objects, etc are. If you understand those things, learning how and why a language does the things it does becomes a lot easier and less about guessing.
As you're learning a language, you're also figuring out what does and doesn't work for you, which helps you in any future attempts you make in learning a new language. So just keep at it. If you're really struggling and your problem isn't just memory-related(forgetting what hiragana makes what sound or what vegetable is in japanese, for example), maybe you would benefit from studying english grammar a bit more or just looking up each part of the sentences you struggle with and figuring out what you need to from that.
If you're a native English speaker (and monolingual), Japanese is in the category of hardest language, and among those is the hardest. This is because the structure is very different from English. In addition, the Japanese course is currently in beta. That means it a rough draft version.
If you've never learned another language before, it's going to be quite the challenge to start with Japanese. If you have an interest in any other languages, it might be a good idea to check out those first.
I've read that Esperanto is a really good language to start with. Personally, I started with Spanish. But, Spanish has a lot of irregulars verbs.
Shantred has a good suggestion, start with becoming more familiar with how English works (if it is your native language). There is a book series that I've found helpful. I have a copy of English Grammar for Students of Spanish. However, they have variations for students of other languages as well.
If you're planning to continue with Japanese right now, I recommend checking out this discussion: https://www.duolingo.com/comment/23407582 You'll definitely want to combine whatever languages you're studying on Duolingo with outside resources.
As for learning a lot of languages, most people with a huge trail of language badges on Duolingo aren't learning them all, they are sampling them. Fluency is not my goal for any of the languages I have badges for. Instead, I want to enjoy learning about them. And, it wouldn't hurt to be able to communicate a little bit with a lot of people. :)
Good luck with your studies!
(1) It gets much easier with each successive language (2) I'm not really expecting to get fluent in more than one or two of them. I mainly want to get to the point of being able to have basic conversations, which is useful for travel, conversing with people I randomly meet from these countries, etc.
The effect of (1) can be huge. Like, each language I learn gets dramatically easier. Like, everyone has told me how hard Russian is, but I find that knowing Spanish, German, Portuguese, and Latin has made it so that a huge portion of the vocabulary, I already know, and even the grammar is very intuitive to me because many of the constructions are ones I'm already familiar with from other languages.
Even in very different languages like Japanese, knowing all the other languages helps immensely. For example, particles in Japanese behave a lot like cases in Russian and German, and the flexible word order which then can be used to change emphasis or connotation, is a little analogous to Russian. The topic prominence is even familiar to me from certain constructions in German, and the omission of subjects or use of implied subjects familiar to me from Spanish (which communicates subject through verb conjugation, but it's often ambiguous and thus implied by context in similar ways to in Japanese).
My second language is German and it was definitely the hardest / slowest to learn.