Hogwarts: All Newbies Have Been Taught the System Before They Come Here

After reading 3 chapters, I think the writing is immature and it should be a newcomer. The creativity is inconsistent with the other two books in the same period. I set up a private magic theory class that is not in the original book. Then, just because the originally ordinary protagonist cast the Patronus Charm in class, he was summoned by the principal and asked Snape to make Legilimency? This is very dramatic, and the Patronus Curse is not a black magic. Dumbledore may monitor and observe the protagonist, but not to this extent. Even if Legilimency is required, he should do it himself, not Snape. I don't know what rules this comment violated, so it was blocked twice.

From the introduction, I feel like this is not the protagonist's system, but Harry's system

How did a squib become a teacher?

The author's writing is getting better and better, and the plot of Legilimency at the beginning is barely rounded out, but the recent plot makes me worried. The protagonist is inexplicably valued by Nicolémeil and is given the Philosopher's Stone (it was originally thought to be another magician's stone rewarded by the system, but it turns out to be Nicolémé's one), and then it is made known to the whole world, causing the protagonist to be forced by the Ministry of Magic to hand over the Philosopher's Stone. I hope the author handles this plot well, because if it is not written well, the plot may collapse. In addition, due to the conflict between the protagonist and Quirrell, the final game happened early, and the author did not explain what is going on with the Defense Against the Dark Arts course now.

Adult wizards can't use magic outside of school? Laughing to death

I just want to know what kind of existence Irene is

How did you, a squib, learn magic?