Is the phrase “the second advice” really correct English? I mean since advice is uncountable, shouldn’t it be “the second piece of advice” instead?
Second piece of advice is much better.
I’m not sure if ‘second advice’ is incorrect, but it’s sounds very odd.
Some “mistakes” are evident but still understandable. Here I had no idea what you meant until you explained it.
“The second advice” doesn’t sound right. But “the other advice” sounds OK to me.
“Word of advice” is also a common phrase.
Advice is a weird uncountable word.
“Let me give you some advice.” This uses the word ‘some’ but it seems like advice is usually singular, as in “a piece of advice”. Giving advice is not usually a whole list of pieces of advice, but a single piece of advice.
‘The second advice’ doesn’t sound right for the reason mentioned by Torsten. Neither does ‘The other advice’.