I hate the small disks, it blocks apt update/upgrade commands usually.

# Top 20 largest folders (directories, i was windows guy)
du -a | sort -n -r | head -n 5

# Top 20 largest files in home folder (directory)
du -a /home | sort -n -r | head -n 5

# My favorite:
du /* -hsx | sort -rh | head -20

# take a look at /tmp
ls -lah /tmp

# Kernel directories are another suspect.
# Check your kernel version
uname -r

# This folder is probably a culprit.
du /usr/* -hsx | sort -rh | head -20
ls /usr/src -lah

If your problem is excessively space occupying old kernel versions: Consider getting rid of the ones which are older than your kernel appropriately.

du -> sort command may fail if there is 0 space.

Check this post out to open up some space on Manjaro How to clean up space in disk on Arch Linux (manjaro)

Check this post out to open up some space on Raspbian linux running raspberry pi: Free up space in debian server while apt-get commands are failing