See some comments below. (I’ll not click on your link in case it does bad things to my laptop…!)

You should run Trueplay on all speakers/rooms ensure the best and optimised sound output from your speakers for each room. 

If streaming music, always go for a service that offers the highest quality supported by Sonos - namely Apple Music (which plays in Lossless, and also in Dolby Atmos where your speakers support that), Amazon Music, and Quboz. Perhaps Tidal too but not sure. 

Every speaker has an EQ. Adjust to taste. 

Very important. Use Trueplay on each speaker, as mentioned. You can run this calibration from the app.

I used to use my Amazon Echo to control the Sonos, but got rid of the Echo as I barely used it, so I currently use Sonos’ built in voice control (on applicable speakers) to control playback outside of the app. It works well, especially as I’m a fan of Gus from Breaking Bad...

This is far too big a subject to cover here. The release of the new app in May created massive headaches for some people. My system works but the CEO has needed to apologise this week for rolling out an app that has made users’ experience worse. So you may or may not have a system that works well. (The advice used to be to plug one speaker in with ethernet to create SonosNet, the speakers’ own network for communicating outside of home wifi. But this is no longer the recommendation, as all the speakers you have are fine to work off of wifi. 

So no tips really. You’ll have to come back on here if you have issues, or call Sonos directly.

The Arc is far superior to the Beam if your room will accommodate it, with native Dolby Atmos where the signal received is Atmos (the Beam has simulated Dolby Atmos as it doesn’t have any up firing speakers). With that, you would be advised for home theatre to get a Sub (optional) and use the 2 x Ones as surrounds if they are already in the same room as the Beam (ensure they are set up as surrounds and not was a stereo pair if you want them for home theatre). The best surrounds are the Era 300s as they support Dolby Atmos with upfiring speakers, but Ones, One SLs, or Era 100s are great too). The Arc/Sub/Surrounds set-up is absolutely awesome with the right content. You can adjust the surrounds for TV and music levels separately. 

Otherwise, the Era 300 for standalone music (or a pair) would be the top choice outside of a home theatre setup. The Era 100 is largely a replacement for the Sonos One, but the difference isn’t that much other than the Era 100 plays stereo from one speaker, whereas the One is largely excellent mono, as you will know.