Are all grounds the same

Quick question, are all grounds the same?

As in I am trying to run a few circuits that all need grounding, can I connect them (the grounds) all to one another so long as they eventually end up at an arduino ground pin?

Intuitively that seems logical to me because there’s continuity between every ground however; I have had some strange behaviours when I have done this in the past.

Hello doubaz
Connect all grounds to one point as a star.

Not too sure I understand exactly, could you please explain further?

These words "star ground connection" in an internet search thingy could return some useful results.

Staying Well Grounded | Analog Devices