How do i transfer photos from a nikon d3300 to my computer?

I have cord to connect to my camera to my computer, but now i don't know what to do

Without knowing what OS your computer is using, it's tough to know exactly how to walk you through it. Try this. Plug the usb cord into the D3300 and your computer. Turn on the D3300 and the file manager on your computer should detect your camera and the sd card with the folders on it. Copy and paste the files you want. If that doesn't work, find someone who has a card reader and borrow it or have them do it for you.

Stick the card into a USB connector that will hold the size card you have and then stick the USB connector into the USB slot on your computer and download your pictures to your computer and save them in "my computer" so you can organize them in any way you wish.