@Barron, it is clear (and cool) that you are somewhat of a newbie on this, so take your time and ask questions to get a handle on it.
Wireless is the big myth. It is often very good, and there are times when it is completely appropriate to use wireless for certain applications. Most notably, using wireless subwoofers in some rooms makes a lot of sense. Especially rooms with a speaker bar and finished drywall.
But, in almost all cases, whenever possible, to help eliminate potential issues, run wires if you can.
Speakers need to have power to make them work. They also need an audio signal. So, a speaker wire carries both power to make the speakers move, and the power that is carried is the audio signal as well. This means that when you run a wire, you take care of two things at once. The power and the audio signal. If you want to use a wireless speaker, then that speaker must include an amplifier of some sort as well as have a means to power it. This means a nearby plug, or battery power. Batteries are fine to run a portable setup for a few hours, but in a home, this is never something you want to deal with. Then you have to figure out how to get audio to that speaker. In a single room with basic audio and no TV, then Bluetooth is very common and can work well. In larger spaces, using the homes wi-fi is common. But, both are subject to potential interference and audio dropouts.
Neither is appropriate for video. This is because wi-fi and Bluetooth both have small delays in their transmission.
If wireless is used in conjunction with video, like wireless headphones designed for TV watching, or a wireless subwoofer, then these systems use a dedicated point to point RF transmitter/receiver that work in near real time. Now, I love my older wireless headphones, but they certainly did pick up a lot of noise in them. My newer digital wireless headphones sound awesome... until I turn on the microwave and they start cutting in and out with audio completely. Yes, wireless seems like a good idea, but it still isn't 100% perfect.
Now, if you are talking about audio quality if sending music from your phone around the home, then there are systems with very little to no audio loss at all. Audio has very little bandwidth compared to video, so it can be sent over many systems with CD quality audio just fine. But, once it is at the playback device, like your Yamaha receiver, then you want to maintain a wired connection all the way to the speakers if at all possible.
There is a lot more to it than this, so you want to consider all your options. For example, your Yamaha receiver may be able to connect to your home's wi-fi connection AND it has a wired network port on the back of the receiver. If at all possible, use the wired connection directly into your home's network. Avoid wi-fi if at all possible for all devices and sources that are located in your theater and throughout your home. Your streaming devices, such as a 'smart' TV, or a media player like AppleTV, Roku, or Chromebox units should be wired. Gaming systems should be wired. This gives them better access to the Internet and your home network and it takes away that overhead from the wireless network.
As for using conduit between the A/V receiver and your TV... This is a completely different subject. But, if it is difficult to run a HDMI cable or other cables between your Yamaha receiver and the television, then you should put in 1.25" or larger conduit so you can add/remove cabling in the future. Otherwise, when (not if) the HDMI cable is no longer appropriate, you can upgrade it to the latest standard without tearing out drywall.
