"You must go home and rest for a bit."
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Yes, because 要 is being used here to form 'a command' (You must) - see https://www.chineseboost.com/grammar/five-uses-yao/
「一定」 functions as a adverb or you could think of it as an auxiliary, helper verb
You can even use 「一定」 with 「要」 as the Duo does here. In that case it may be easier to think of 「要」 as "to have to" and 「一定要」 as "must do" or "definitely have to". In fact 「一定」 can be used with most verbs
I have a Chinese test tomorrow, so I have to go to school
明天我有国语的测试、所以我一定去学校 I have a Chinese test tomorrow, so I [must\definitely have to] go to school
Even the Duo sentence here can be verbally split into 「要」、「一定」、or「一定要」回家 I believe
So I admit I'm a beginner, but here is where I get confused. If I see translations of it, eg here:
Then, "must" comes up as one of the options. It also gives must as a translation in this duolingo word list:
No doubt you're right. I just feel duolingo is very much not clear at times.