vi ~/.vimrc

syntax on
colorscheme default

if only temporally:
:syntax on

"ayy this will store the line in buffer a

"ap this will put the contents of buffer a at the cursor

There are many variations on this

"a5yy this will store the 5 lines in buffer a

yy

will yank the current line without deleting it

dd

will delete the current line

p

will ‘put’ a line grabbed by either of the previous methods

OR just YP or Yp or yyp

Copy and paste 10 lines:

y10yp