In the context of VIM, it is always true that there are several ways to achieve certain effect; at the minimum, there are both, the short and long ways as well as the wrong one.
In particular, on the issues of buffer navigation, the correct way to jump to the start of the 1st line of the current buffer is the command gg, conversely, when the goal is to move to the start of any other line, nnn G is the way to go; what it mneans is simple:
place te cursor at the start of the line which number is equal to nnn; the absense of the parameter denoted by nnn (count) means that the start of the last line is the target.
Now that the proper foundations have been set, it should be very straight forward to understand the following assertion:
As a consequence, any sequence that neglects the former assertion to execute an operation relative to the 1st line of the current buffer using 0G is off base, or put if differently, assuming that 0G will move the cursor to the start of the 1st line of the current buffer is wrong.
In fact, the result of executing 0G is:
0 – jump to the start of current line.
G – jump to the last line of current buffer.
notice that (1) 0 is reserved to refer to the start of the current line therefore (2) the result is actually the opposite of what is expected.
misconstruction: the sequence d0G deletes from current line (inclusive) to the 1st one (inclusive) of the current buffer
reality: it is not even 1 single sequence, it actually performs 2 operations:
d0 – edit the current buffer by deleting every character from the current cursor position to the start of the same line.
G – jump to the beginning of the last line of the current buffer.
In a large document, whatever it was deleted might be out of (visual) scope, forcing the user to undo the las change (u) or to navigate through the list of changes (g; g,) only to realize that things didn't happened as expected.
When the need to perform an action relative to the (start of) 1st line of the current buffer arises, use gg as the reference.
Proper way to perform the aforementioned deed is: d gg.
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