Danke zu all menschen dass sprechen Deutsch in die kommentare. Sehr hilfreichen! (Thank you to all that speak German in comments. Very helpful!)
I enjoy the experience of reading the comments!
"Danke an alle Menschen, die in den Kommentaren Deutsch sprechen. Es ist sehr hilfreich!" ;)
You still stick a bit too closely to English speech patterns. Those don't always work in German - but I think you'll get used to it if you continue studying German!
Viel Spaß und viel Erfolg auf deinem Weg! Und viele interessante Kommentare auf Deutsch ;) (I wish you a lot of fun and a lot of success on your way. And many interesting comment in German!)
The only form of "that" that Duolingo ever teaches you is dass, I believe, which is why everyone here uses that instead of der/die/das/etc. Assuming German gets an expanded tree someday, that's definitely something for them to add, I think.
I once did a placement test in German for fun (and deleted it again as it felt like cheating to test out your native language) but never had a closer look at the tree. If they really only teach "dass" that would explain a lot... But technically, the distinction should be fairly easy for English speakers? Assuming that you talk about persons, if you could replace a "that" with "who", you use "der/die/das". That's also the way how Germans get taught the difference between "das" and "dass" (which is a common mistake similar to mixing up "they're" and "their" in English). Can you say "welches" instead, it's "das" otherwise it's "dass".
In modern colloquial English, at least around here, the who/that distinction is basically gone. "Thanks to everyone that uses German in the comments" isn't really incorrect - "who" sounds better to me, but then I speak in a "higher register" than most people, if that makes sense.
That doesn't really change the fact that it's quite an easy system to learn. It's pretty intuitive. You just have to be taught it.
Yes, my comment wasn't aimed at saying that 'that' is wrong. Just that you could also use 'who' in some situations and these need a 'das' instead of 'dass' in German.
And well.. It's easy if you learn grammar easily. I never had a problem understanding the system but I know some native speakers who make mistakes like that on a regular basis (and we are taught these rules at school!)