3 file huu ich khi lam wap 1. La file _header cac bao tao file nay xong viet gi vao do thi n se hien thi o dau tat ca cac trang cua ban. Vd: nhu logo,loi khuyen... Giong nhu logo & cai guebook cua admin day. 2. file _footer file nay cung co cong dung nhung file _header nhung lai hien thi o cuoi trang ban co the them bo dem, menu nhanh... 3. file 404 day la file bao loi khi nguoi danh sai dia chi 1file, hoac file do da xoa di thi no se xuat hien, xuat hien nhu the nao la do ban. Vd: ban tao file 404 roi ban ghi hang chu "xin loi trang nay khong ton tai" thi khi no xuat hien co cung co chu nhu vaychu y: cac file _header, _footer phai co dau "_"(gach duoi o dau) neu de file _header xua hien o trang chu nhieu ban se khong thich nen minh se tim thong tin ve van de hien thi file _header va _footer tren trang chu de bo sung them cho bai viet, ai biet thi lien lac voi minh nha.thanks
