No worries, we all started somewhere with the terminal 
If you have access to TTY , from where you shared the inxi picture, then run this commands:
sudo pacman-mirrors -f && sudo pacman -Syyu
Hopefully you have internet access, but as i see the state is down for the network … Maybe the easier way would be to boot the Live Media install, from USB and chroot the installed system as explained here:
From within the chrooted system you make sure the system is updated with the given command above. Then you install the 4.19 kernel
sudo mhwd-kernel -i linux419
Then you reboot into the installed system, and at Grub you select the 4.19 kernel.