THE BASIC QUESTIONS
6) The version i use:

The version:

pacman -Si xf86-video-nouveau

Repository      : extra
Name            : xf86-video-nouveau
Version         : 1.0.16-1
Description     : Open Source 3D acceleration driver for nVidia cards
Architecture    : x86_64
URL             : https://nouveau.freedesktop.org/
Licenses        : GPL
Groups          : xorg-drivers
Provides        : None
Depends On      : libsystemd  mesa
Optional Deps   : None
Conflicts With  : xorg-server<1.20  X-ABI-VIDEODRV_VERSION<24 
X-ABI-VIDEODRV_VERSION>=25
Replaces        : None
Download Size   : 84.94 KiB
Installed Size  : 259.00 KiB
Packager        : Andreas Radke <andyrtrNOSPAMarchlinux.org>
Build Date      : Tue Jan 29 17:13:41 2019
Validated By    : MD5 Sum  SHA-256 Sum  Signature