I typed df -h and this is the result

root@azalelnation:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/vda1        79G   76G     0 100% /
none            4.0K     0  4.0K   0% /sys/fs/cgroup
udev            3.9G  4.0K  3.9G   1% /dev
tmpfs           799M  332K  799M   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            3.9G     0  3.9G   0% /run/shm
none            100M     0  100M   0% /run/user
overflow        1.0M  768K  256K  75% /tmp

Does this really look like it’s full? the /dev/vda1 still has 3 gigabytes left

As it says: Avail 0

What file should I delete? In which folder? Because Idk how to reduce it ):

Nvm. Solved. Thanks!