Hello. I struggled with configuring everything for accelerate haskell library, and during the process I deleted llvm-libs with sudo pacman -R llvm-libs. Then I did reboot and instead of my manjaro I see some terminal (cli tty(?)). I don’t really know what I have done and how to fix the problem without reinstalling the system. Please, help me.
EDIT: I’ve already tried to reinstall it with sudo pacman -Syu llvm-libs, but that itself doesn’t help.
Welcome to the forum! 
Then reinstall it with:
sudo pacman -Syu llvm-libs
I’ve already did it, but that itself doesn’t help 
You could check your pacman log and reinstall everything you removed if you want. However, it would be probably be faster and easier to reinstall. You removed a lot more than that, apparently.
You’re not learning anything if you don’t break something once in awhile. 
Do you mean to reinstall entire system? I have lot’s of stuff there
Relating the learning, after that problem I thought of installing arch and start everything with a clean slate…
It really seems like I’ve removed almost everything…
Always backup.
You can boot from a live ISO and backup files somewhere. You can also use manjaro-chroot to access your system if needed.
Did I mention backups?
Thank you very much for your support!
Sorry, I know very little so far. Do I understand right that I need to download a manjaro ISO, burn it to a USB, boot into the system on the USB, access terminal, enter manjaro-chroot and somehow choose the already existing system. But how can I make the backup and how do I recover my manjaro after that?
Yes, but you can access your files from the live system without manjaro-chroot. That’s only if you want to access the system to try fixing the system if you want to try that.
I don’t think I want to attempt that now. But will I (and maybe how) have my files from the old system on the new one?
No, not unless they’re on a separate partition or drive.
Again, from the live system you can access your files from the file manager.
I think I can make it simplier. I have Ubuntu also on my laptop. Will work from there for now.
Thank you very much for your help!!!