How can i find my hard drive size and available size left on my older macbook late model 2006 13' black

Select the Macintosh HD disk icon on the Desktop. Press COMMAND-I to open the Get Info window. In the upper pane you will find the drive's Capacity, Available, and Used space displayed.

Happy to be of assistance.

Please note the items listed under Legend in the right sidebar of this page. 🙂

Right click (Control + Click) on your hard drive icon and choose Get Info. Capacity = Total size of the hard drive. Available = Unused space on your hard drive. Used = Storage used on your hard drive.

Open Terminal and type "df -h"