gg moves to the beginning of the buffer.
G moves to the end of the buffer.
: followed by a line number the moves to that line number .

1. typing / followed by a pharse searches FORWARD for the pharse.
   typing ? followed by a pharse searches BACKWORD for the pharse.
   After a search type n to find the next occurrence in the same direction
   or N to search in the opposite direction.

2. typing % while the cursor is on a(,),[,],{,or} locates its matching pair.

3. To substitute new for the first old on a line type :s/old/new
   To substitute new for all ‘old’s on a line type :s/old/new/g
   To substitute phrases between two line #’s type :#,#s/old/new/g
   To substitute all occurrences in the file type :%s/old/new/g
   To ask for confirmation each time add ‘c’ :%s/old/new/gc

4. To save part of a file type :#,# w filename