How can I increase hard drive space on my mac book pro

I have only about 30 gb left on my hard drive. I have a mac book pro I bought in 2013. I've deleted or transferred to an external hard drive
as much material as possible. How can I find out what is taking up all the room?? My dropbox always says it can't sync because I don't have
enough room on my hard drive. Why isn't 30gb enough? Please tell me how I can find out which files are taking up so much room and how I can
find out what I can get rid of (are there programs I don't know about?) thanks
Isabella

Freeing Up Space on The Hard Drive
  1. See Lion/Mountain Lion/Mavericks' Storage Display.
  2. You can remove data from your Home folder except for the /Home/Library/ folder.
  3. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
  4. Get an external hard drive on which to store some of your files after which you can
      erase the data from your internal drive to free up space.
  5. Also see Freeing space on your Mac OS X startup disk.
  6. See Where did my Disk Space go?.
  7. See The Storage Display.
You must Empty the Trash in order to recover the space they occupied on the hard drive.
You should consider replacing the drive with a larger one. Check out OWC for drives, tutorials, and toolkits.
Try using OmniDiskSweeper 1.8 or GrandPerspective to search your drive for large files and where they are located.

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