There is a nice text editor called GEdit, I'm not sure what photofiltre is, but it sounds like Photoshop so I'll say that Linux has The Gimp for that.

Dual booting is where you can boot more than one operating system. You choose the operating system when you turn on your computer.

I would recommend parallel booting instead though because I think it's easier. That's where you boot towo or more operating systems at the same time. Switching back and forth between platforms is as simple as Ctrl + Alt + Tab instead of having to reboot.