"The wine is tasty."
Translation:Wino jest smaczne.
„Wino” is neuter, therefore it requires the adjective to be neuter too. Hence neuter „smaczne” instead of masculine „smaczny”.
I'm doing the French course as well right now: I accidentally just typed the answer as 'Le win jest smaczny'. I put 'smaczny' because I was thinking 'win' is masculine. And also I put 'Le win', not 'Le vin', which made it even more funny because I at least made it a Polish 'v' sound. Just thought I'd share this funny story.