Modern Linux systems have plenty of tools for both Gnome and Kde to analyze the disk space. But if you log into a server via SSH or similar, you’re out of luck. You need a tool for Cli Disk Usage analytics. That tool is ncdu.
You can install it easy:
sudo apt-get install ncdu
Issuing ncdu inside the folder you want to check will open a cool ncurses interface, really easy to use 🙂