Laro, all of this just requires average intelligence, and a bit of patience to learn something new. Audio, especially good audio, is not usually done in the pursuit of instant gratification. It has nothing to do with age. My 87 year old mother can run her Sony HT Receiver with various inputs, now that she's been taught, and has had time to get comfortable with it. Once correctly configured, a HT (Home Theater) receiver is quite simple to operate these days.
If you are sending back your system just because you haven't figured out some things, I suggest you hold off until you let us help you sort it, and then decide. But if it's shipped already, then it is what it is...
In regard to your question, do powered or active speakers require a receiver? The powered speakers all have built-in amplifier(s) with multiple inputs similar to a receiver; but don't have any 5+ channel capability (2.1 only), or the ability to switch HDMI sources, or display anything on your TV screen. Most powered speakers have quite a few inputs, and typically a small remote to control things.
To me it sounds like you bought the wrong receiver if you want two HDMI outputs for a TV & Projector. Lots of receivers have 2 HDMI (or more) outputs so you can drive TVs, Monitors, and Projectors. I think all you have to do to get YouTube sound is connect the TV via HDMI (TV OUT / ARC) on the Connect One Hub, and set the source on the Sony receiver to TV. However, the Samsung Manuals do not give any clarity if one of the Connect One Hub HDMI Inputs is ARC, but I expect at least one is. Please confirm.
You need to typically think of the Sony HT receiver as the nerve center where all of the sources connect to it and then it funnels the selected video portion to whatever it's connected to. However, when you use a Smart Hub source from the TV (Netflix, YouTube, etc.,) the TV controls the video and sends the audio to the receiver via the two way ARC (Audio Return Channel) HDMI cable.
As lovinthehd said, tell us what you want to do and we can help you sort it. Tell us what you want to connect to the system, preferably with make and model numbers and /or links to the manuals. There's a lot of talent here who can assist if you just work with us a little. It's really not that hard.
I hope this is helpful.