B??c two: Nh?p s??ti?n n?p, h??th?ng s??t?o mã QR t??ng ?ng (th?i gian hi?n th??Hello?u l?c trong vòng fifteen phút).Summarize Propose changes Like Post Like Conserve Share Report Cheatsheets are short files that incorporate all the most vital information about a particular technological know-how in short, for example its syntax, instructions, c