:set et|retab

https://github.com/tpope/vim-unimpaired/blob/master/doc/unimpaired.txt

You can do <C-r>" to paste from the default register or <C-r>a to paste from register a.

Additionally:

Ctrl-y Moves screen up one line
Ctrl-e Moves screen down one line
Ctrl-u Moves cursor & screen up ½ page
Ctrl-d Moves cursor & screen down ½ page
Ctrl-b Moves screen up one page, cursor to last line
Ctrl-f Moves screen down one page, cursor to first line

Ctrl-y and Ctrl-e only change the cursor position if it would be moved off screen.

I try to use vim without any plugins as I don't want to rely on them when I work on another system. Coming upon this same issue now, I can propose some 'better ways' (alternative ways) as requested by the OP:

c-w-| to have window take over (if using vsplits). c-w-= to restore. c-w-_ for horizontal splits
close the other window(s), thereby making current one fullscreen. Split and re-open from buffer to restore

Comment j'ai fait pour me passer de nerdtree?

current line in top of screen : z<return>
go to next blank line (paragraph) : }