g7s

Yeah, but don't tell other arch users you are using EndavorOS... jk!

Guter

When you boot up the arch iso, you can use a script called arch-install

Shhhhh, don't let lemmygrad users read this

Honestly, the best thing I learned was: Need to fix your system through the install medium? Save yourself keystrokes of mounting by just mounting the root subvolume (to /mnt) and then type: mount -aT /mnt/etc/fstab --target-prefix /mnt. This reads your fstab and mounts everything for you.

Thank you so much for it :D

It absolutely can be only pacman, if the mirrors chosen are on the other side of the planet.

Maybe you should uncomment the country option, and specify your country and a few close to you. Latest synchronized, doesn't mean they are close to you.

Furthermore, check your mirror's status here

Show us your reflector conf and your mirrorlist.

No money for Windows :P

You learn more about the components of your system, and therefore learn more about fixing things or debugging what could be wrong. Arch is only difficult once.