Wazifas

Why didn't Nabi (sallallahu alaihi wasallam) go into the details of sihr?

Q: I know that learning sihr is not allowed in Islam but what is the ruling on learning about sihr? There is a ruqya course on YouTube whose ustadh has an ijaza in the 6 books of hadiths and is an experienced raaqi but he goes into a lot of details on the kufrs the magician commits, how sihr is performed, and tells the meanings of the numbers in taweez and how the magicians use numbers to calculate the taweez. He has also read actual magic books (e.g. Shams al ma'arif, etc. for "informational" purposes maybe). We also come to know that the magicians say the name, "Baal" and blow on the knots. Even the footage of an actual magician is shown when he was being exposed. If this was allowed, why didn't the prophet (sallallahu alaihi wasallam) go into so many details? And of course, he tells us how to destroy the taweez and perform ruqya. I find it very iman boosting as it shows that Islam is the truth but am I sinning by watching these videos?

Protection from black magic

Q: My mother suffered with asraat a few years back. Alhumdullilah she got cured back then with the help of Quran. That time the raqi did say that there was black magic done on my mother but he didn't say who did it. I have observed my phupo (dad's sisters) that she only visits our place on full moon days like purnam or something like that...

I don't know what it is but it makes me worried for my parents. We, as a family have seen hell this long. I don't want to think anything evil about my phupo but it just flashes in my mind... Please help me with any dua or anything that could make me get rid of this feeling.