Im learning about basic electricity do i have to learn about AC electricity ? Will i have anything to do with it in laser hobby ? And i read somewhere about laser radiation and risk of cancer at high power lasers contacts skin is it true ?
Well technically that's the harm It's a weird way to ask a question.
Lasers are dangerous, no way around that. There's no "radiation" as in, gamma and particle radiation present in nuclear reactions, unless you use a nuclear reactor to power your laser.