Please explain excavator specs

I am new to excavators and I been looking at a minis and I am not too sure I understand the specs and could use a bit of help?
Here is an example of one set:
I. Max Cutting Height 15.4 ft in 4700 mm
J. Max Loading Height 10.4 ft in 3180 mm
K. Max Reach Along Ground 16 ft in 4880 mm
L. Max Vertical Wall Digging Depth


What is cutting height?
The max reach along the ground - dos this mean I could roughly reach out 15' to clean out a ditch (shallow)
What is a 2' flat bottom measurement? how is that derived? (some list it some don't)

THANKS

Please explain excavator specs