Tick vs Backtick
' jumps to the line of a mark. ` jumps to the exact position.
' (apostrophe) is linewise: jumps to the line of the mark, lands on first non-blank. ` (backtick) is charwise: jumps to the exact stored line and column.
Every mark has two ways to jump to it: โข '{m} โ jump to the line of mark m, cursor on first non-blank. Linewise. โข `{m} โ jump to the exact position of mark m. Charwise.
See also: Setting and Jumping to Marks, Special Marks