I just sorted out some common commands in vi.

Shift + H move the cursor to the top shift + M move the cursor to the middle shift + L move the cursor to the bottom shift + G move the cursor to the end vi filename create filename File
All three commands of I a o can be edited.
: Wq save and exit
: W save
: X save and exit
: Q! Do not save and exit
Shift-6 move cursor to line head
Shif-4 the cursor is at the end of the line
Shift + H move the cursor to the top shift + M move the cursor to the middle shift + L move the cursor to the bottom shift + G move the cursor to the end
Page up page down
U undo
Ndd delete multiple rows
. Repeat a command
Yy copy a row
P paste
: R filename copy file
/Search
// Find the escape
: S/old/new replacement
: S/old/new/g to replace a row
: % S/old/new/g replace all
: % S/old/new/gc ask to replace all
: Set nu display row number
: Set nonu undisplay row number