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Low disk space on filesystem root - Fedora 28

Hi everybody. I start saying that I'm totally new to the Linux world. I installed the latest version of fedora one week ago, shrinking 23 gb of space, partitioning from my Windows (I actually have dual boot, Windows 10 and Fedora 28). After setting up all the required things, I installed VirtualBox. I then installed the Kali Linux ISO onto the machine, . While doing the installation of Kali, the computer started lagging, and showed up this message: "Low disk space on filesystem root". I then run the df -h command, but I don't fairly get the point of the situation. Here below the script I run.

[ethicalhacker@new-host-2 ~]$ df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 1.7G     0  1.7G   0% /dev
tmpfs                    1.7G   22M  1.7G   2% /dev/shm
tmpfs                    1.7G  1.9M  1.7G   1% /run
tmpfs                    1.7G     0  1.7G   0% /sys/fs/cgroup
/dev/mapper/fedora-root   20G   19G   55M 100% /
tmpfs                    1.7G  148K  1.7G   1% /tmp
/dev/sda7                976M  173M  737M  19% /boot
/dev/sda2                256M  119M  138M  47% /boot/efi
tmpfs                    339M   16K  339M   1% /run/user/42
tmpfs                    339M  5.7M  333M   2% /run/user/1000

[ethicalhacker@new-host-2 ~]$ sudo du -hs /*
[sudo] password for ethicalhacker: 
0   /bin
289M    /boot
0   /dev
30M /etc
11G /home
0   /lib
0   /lib64
16K /lost+found
4.0K    /media
4.0K    /mnt
4.0K    /opt
du: cannot access '/proc/5406/task/5406/fd/3': No such file or directory
du: cannot access '/proc/5406/task/5406/fdinfo/3': No such file or directory
du: cannot access '/proc/5406/fd/3': No such file or directory
du: cannot access '/proc/5406/fdinfo/3': No such file or directory
0   /proc
52K /root
du: cannot access '/run/user/1000/gvfs': Permission denied
2.0M    /run
0   /sbin
4.0K    /srv
0   /sys
12K /tmp
5.0G    /usr
2.9G    /var
[ethicalhacker@new-host-2 ~]$ 

I don't really know what to do. Maybe should I delete some awful files, or just add space? If you (probably) need further information, just ask me.