How do you connect it to a laptop when the projector hangs from the ceiling? Do you need more special, more expensive projectors that you can connect via Bluetooth or Wi-Fi or similar? I want to grow one but I'm inexperienced
You can also buy a long VGA or HDMI cable that runs along the wall with a cable duct from the hardware store and then plug into your laptop. Usually also done in conference rooms etc.
There are several options. In general (and this is still the best quality and most reliable) you pull a cable from the ceiling to the transmitter (HDMI at best).
Otherwise, there's the option to send the image via wireless sticks. Just enter wireless beamer on Google.
There are those who can be controlled via Wi-Fi, but then they are not with whom you want to watch movies but rather for presentations