Well you can move files, not apps, to the SD card (if you have one inserted) and that will give you some room. You should also restart the phone (turn it off and back on) regularly to clear up some of your space. You may also want to do things like clear the browser history and cache (done from the browser app and then in that apps settings) to clear up some space. Also try uninstalling apps that you don't really use.
If you want to just move files (photos, videos, music, etc.), not apps, to the SD card you can use the file manager app that is on the device, or if there isn't one you can download and install one to access and move the files. Sadly, they usually only let you move one or two at a time.
To move them all at once, or in...