e - move forward the end of the word
b - move backward to the beginning of the word
eb - selects the whole word

% - select whole file
v - enters Select mode - movement will extend the selection, as opposed to replacing it.
v2w - select two words.

t Enter - select from the current position till the end of the line
T Enter - select from the current position to the beginning of the line

; - collapse selection onto a single cursor

p - paste after selection
P - paster before selection

C - duplicate the cursor to the next suitable line
, - remove first cursors

Buffer is a file. You can open multiple files simultaneously.

Space - b - buffer picker
:bp - previous buffer
:bn - next buffer
:bc - close current buffer