Three Questions

1.) Is Prince the balanced difficulty level?
2.) Is there a comprehensive strategy guide for civ 6 on xbox one?
3.) Can someone give me some good advice on how to play the game well for a beginner?

 

1.) Yes, Prince is the difficulty where neither the player nor the AI gets any bonus.
2.) I dont think Xbox is any different to PC apart from the controls so you can pretty much use every guide out there.
3.) @Victoria has lots of helpful guides in the bio. I can also recommend PotatoMcWhiskys overexplained videos on youtube.
Also pick some "easy" civs for the start like Rome, Japan or Greek (Pericles). Their bonusses are not the most complex ones but they are strong and you can concentrate on learning the rest of the game. Keep an eye at your policies and change them often. You can always do so for free when you reseach a civic. This makes culture a very important yield early on.
Also try to get lots of cities up, wide is much more efficient than tall.
Keep in mind that only the combat strength difference is important for the damage calculation not the ratio. So even if 5 looks like a little when your units have 80 strength but it is still 20% more dmg dealt and less taken. Also its exponential 10 cs differnce is already +50% -50%. If you get into a defensive war keep in mind that your strongest melee unit decides your cities strength and your strongest ranged unit its ranged attack (if you build walls). So upgrading or buying a modern unit at the start of a war can be very helpful.
Plan ahead for eurekas and inspirations. They are actually a lot of free science and culture of a whole game. Most games you wont get all of them but if you can get one without too much effort its definitely worth going for it.
The yields ribbon you can enable in the game options is a great tool to get some quick information about everyone else. You can see if you start to fall behind on science, culture or military with one look.

 

There is no comprehensive guide because it’s too complex. I remember reading a really good civ V guide because it was a little more linear in approach.
I found just playing the game a bit at the start was just great and then asking questions is a good way to go.
@Buktu advice is of course sound like all advice on the forum. To me there are a few tips that really help.

1. For the first 70 turns getting your cities out is important, whether building or conquering.
2. Keep your cities together, if they are left in a place with more enemy cities closer, they are likely to change sides
3. When fighting, try to defend rather than attack, especially at the beginning. Fortifying yourself on a hill and being attacked is far better than attacking back.
4. There is a civic that gives double adjacency for a campus, getting a few good adjacency campus then using this card makes the game a lot easier to play.
5. It’s a game, first and foremost, don’t burn yourself out on it, it s something to do for fun. The game can get a bit long and dull near the end to some people. But it is still a good game.

if you are reading this from a browser you will see some guides just below that cover some key aspects.

 

How else can one read a forum's post?

 

Sorry, from a browser on a PC.