No worries! I'm moving this to the appropriate PBP forum, so you can get the right help.
I think there's one thing I can certainly address now, too. Concerning Android/Chromium: Neither currently has access to the Play Store. Chromium needs some fine tuning to get that going, and the Android builds are capable, but you'll have to push the Play Stroe apks through adb. There's a few tutorials for this, though, in the RockPro forums. You can find them pretty easily by searching for Play Store.
Also, just to be concise, it's important to note that dual booting will entail keeping your alternate OS on an external media (SD is favored,) as both OS options cannot really live and boot from the same drive currently. (There may be tricks to get around this, but it won't be anything like setting up another OS in Grub.)
I think there's one thing I can certainly address now, too. Concerning Android/Chromium: Neither currently has access to the Play Store. Chromium needs some fine tuning to get that going, and the Android builds are capable, but you'll have to push the Play Stroe apks through adb. There's a few tutorials for this, though, in the RockPro forums. You can find them pretty easily by searching for Play Store.
Also, just to be concise, it's important to note that dual booting will entail keeping your alternate OS on an external media (SD is favored,) as both OS options cannot really live and boot from the same drive currently. (There may be tricks to get around this, but it won't be anything like setting up another OS in Grub.)