You can try reading this link in Club Snap. "Good sites for Nikon users" located at Equipment discussions / Nikon
You also can try the public library nearest to you. There are plenty of photography books and magazines.
If you like to buy some books related to photography, you can drop by Kinokuniya at Orchard road. They have the widest selection of books related to photography.
On a personal note, If you are completely new to photography and the D5300 is your first camera, may I recommend this book to you, by Peahpit Press on the D5300.
(Nikon D5300, from snapshots to great shots, by Rob Sylvan). Kinokuniya surely will have in stock.