I'm new to Elementary and Linux in general. Just installed it today. How do I find how much disk space I have and more general information about my hard drive like you can in Windows and Mac OS X? Thanks.
Click Power button at the top-right corner of the screen, then select About This Computer in drop-down menu.
If you want a command line solution try running
df -h in terminal. Example output on my laptop is below.
udev 2.7G 12K 2.7G 1% /dev tmpfs 538M 1.5M 536M 1% /run /dev/sda6 48G 34G 12G 75% / none 4.0K 0 4.0K 0% /sys/fs/cgroup none 5.0M 0 5.0M 0% /run/lock none 2.7G 70M 2.6G 3% /run/shm none 100M 60K 100M 1% /run/user /dev/sda5 298G 148G 151G 50% /mnt/storage /dev/sda2 96M 68M 29M 71% /boot
It shows the free disk space for all mounted partitions
I'd second @roman's answer. "About This Computer" is probably the simplest way to get information about your hard drive.
For more detailed information, you could install Disk Usage Analyzer or Disk Utility from the Software Center. Disk Usage Analyzer is a lot like DaisyDisk for OS X, and Disk Utility is a lot like OS X's Disk Utility.