I bought a small home theater setup.
With:
The Acer H5382bd projector
An Xbox One S
And a Sony bdv E2100 sound system
My question now is how I can connect the whole thing or which cables I need
Probably HDMI, connecting XBOX to a soundbar (generally speakers and speakers) is a bit complicated, you probably have to plug the projector somehow
The Xbox One with the projector via HDMI
And the sound system on the projector too. There has to be a connection somewhere.
You logically connect the projector via HDMI.
You have two options for sound.
The first would be to take the sound off the projector because it is looped through the console's HDMI.
The second option is to connect the system to the Xbox using optical cables.