Hey there! I really do like your guide, as it's pretty comprehensive and easy to read, especially for someone newer to Bard or the game. I do have a couple of suggestions, though:

• Putting separate chapters for every ability is a bit unnecessary. I think it'd be much better if you merged the ability explanations/tips into one chapter, for better clarity and smoothness.
  
  
• Your chapter order isn't ideal for readers, like how you put the items section before explaining any abilities. I think you should have it as Intro --> Pros and Cons --> Abilities --> Ability Sequence (might want to add this) --> Items --> Laning --> Roaming --> Teamfights/Objectives --> Conclusion.
  
  
• Your items section isn't extremely in-depth, and may be confusing to a newer player who isn't familiar with all the League terminology/strategy. Go through each item and explain what it is, how to use it, and how it goes well with Bard.
  
  
• Why max Caretaker's Shrine last? When you need to roam and leave your ADC alone, leaving them with some sustain is really helpful, and if all you've got is a level one shrine, it won't help them as much as the increased damage from Cosmic Binding. Not too sure about maxing Magical Journey second, either. Wouldn't the increased stats from leveling Q and W trump a little extra speed through your tunnel? Try making a chapter explaining your choices, and feel free to correct me here if I'm wrong. :)
  
  
• Wouldn't Mobility Boots be ideal for a roaming support? You'd be able to get around much faster, with the additional speed from your Traveler's Call chimes.
  
  
• In your final build, you have Frostfang, which upgrades further into Frost Queen's Claim, a much better item. Why have the unupgraded item in a full build?
  
  
• Try adding some headers or pictures to spice up things a little. There are some amazing artists here on Mobafire, and they'd be glad to help you out.
  
  
• Turn on Comment to Vote! You already got an unexplained downvote, and having C2V on will discourage random/troll voters.

These are just suggestions, of course, and you're wholly entitled to ignore everything I'm saying. I really do like this guide, though. Best of luck!