How to use marks in Vim

http://vim.wikia.com/wiki/Using_marks

Command	Description
ma	set mark a at current cursor location
'a	jump to line of mark a (first non-blank character in line)
`a	jump to position (line and column) of mark a
d'a	delete from current line to line of mark a
d`a	delete from current cursor position to position of mark a
c'a	change text from current line to line of mark a
y`a	yank text to unnamed buffer from cursor to position of mark a
:marks	list all the current marks
:marks aB	list marks a, B

Command	Description
]'	jump to next line with a lowercase mark
['	jump to previous line with a lowercase mark
]`	jump to next lowercase mark
[`	jump to previous lowercase mark

Command	Description
`.	jump to position where last change occurred in current buffer
`"	jump to position where last exited current buffer
`0	jump to position in last file edited (when exited Vim)
`1	like `0 but the previous file (also `2 etc)
''	jump back (to line in current buffer where jumped from)
``	jump back (to position in current buffer where jumped from)
`[ or `]	jump to beginning/end of previously changed or yanked text
`< or `>	jump to beginning/end of last visual selection

Command	Description
:delmarks a	delete mark a
:delmarks a-d	delete marks a, b, c, d
:delmarks abxy	delete marks a, b, x, y
:delmarks aA	delete marks a, A
:delmarks!	delete all lowercase marks for the current buffer (a-z)