second section sayes it cant be followed by a conjugated verb but it has been in first section when words being introduced, what am i missing?
That's true, Chris, but when they talk about "a conjugated verb" in this, and other lessons, they usually mean a pronoun/noun followed by a conjugated verb. So that's not the explanation.
But in the first section you'll see that there is always a comma after the phrase, so it's not directly connected to the verb, e.g.
"Le lendemain, j'allais m'inscrire à l'université."
"The day after, I was enrolling at university."
You can't use "le lendemain" to say something like "The day after I enrolled at university I met Paul."
Actually, le lendemain isn't followed by a verb in the lesson examples. If you look carefully you'll find it is followed by a personal pronoun.
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