How can I add tools like GCC on EOS?

Endless doesn't ship with tools like gcc in the base OS, but you can add them to run/build apps inside a Sandbox using Flatpak. http://flatpak.org/developer.html  has detailed developer instructions, but these commands will get you a shell where you can run GCC:

flatpak install flathub org.gnome.Sdk//3.28
flatpak run --devel --command=bash org.gnome.Sdk//3.28

You also may be interested in the Builder IDE for GNOME and other development tools which are now available for download via the app center.

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