Difference between backtick and single quote for marks

Question

Section 3.10 told me that:

The command "'mark" (single quotation mark, or apostrophe) moves you to the beginning of the line containing the mark. This differs from the "`mark" command, which also moves you to the marked column.

But when I :help ' or :help ` I am given the exact same help, which is:

                    *'* *'a* *`* *`a*
'{a-z}  `{a-z}      Jump to the mark {a-z} in the current buffer.

So according to the help file there is no difference, right?

Answer 1

It is the first paragraph that gives you the correct understanding.

The start of the Mark section (few lines before the lines you quote) is:

Jumping to a mark can be done in two ways:
1. With ` (backtick):
   The cursor is positioned at the specified location
   and the motion is exclusive.
2. With ' (single quote):
   The cursor is positioned on the first non-blank
   character in the line of the specified location and
   the motion is linewise.

Unfortunately, you also need to read the context to have the right understanding of the doc.