Hello everyone, I’m a newcomer to WF. I’m quite young — I’m 19 years old — and I’m from Asia

I guess that’s a bit different, haha.
I discovered WF when I was researching sigils, and it led me here. Reading many topics and discussions about magic and the occult has been really fascinating to me. However, after about two days of learning and researching, I feel that it’s quite complicated — maybe because I don’t have much experience yet. Also, my English isn’t very good, so reading books is a bit difficult for me.
I think that’s enough sharing for now. I’d like to ask a few questions:
Is a sigil considered a spell or a kind of charm?
Is it something that can be abused, and how should it be used properly?
And can magic be used to take revenge on someone? If so, where should I start, and what materials or resources would help me with that?
Thank you very much for reading everything, and sorry if my post sounds a bit silly, haha.
Have a nice day!