1. Conversations messages

are written either by you on your own account or by any other user on Their Account

- & you can also write messages to other users in Their Conversations' space ( called 'feed' ) or they can write a message to you on Your Conversations space ( your feed ) 

*Conversations are located on the left lower corner of the Screen 

- & Visible for Everyone who checks your account 

So you can write messages to Your Followers informing them about something ( for example that 'you'll be offline for a few days & when you come back' ) on Your Conversations space - or just use it for talking to them, mentioning their username there

- & everyone will see your conversation 

2. Inbox

- if you don't want other users to see 'What you're talking about with a friend', need some advice from them or just feel 'more comfortable talking to them there' than in Conversations ( because it looks like a 'chat window' ) - use inbox 

- because the messages you send to each other in Inbox are visible only to You & to the other Person you talk to - noone else can see Your Inbox messages - just You Two 

( In inbox you can talk to only one person in one conversation 

- & you can talk to any number of users in Your 'Conversations space' ( on your feed )

because they can answer your message if they want to join the conversation or know the answer to your question :) )

3. Notifications

are to inform you that 'someone commented your book' or 'Someone you follow updated their book' 

If they are about your books getting comments

- they show all the comments in one place, one under another

informing you 'which user commented what book' & 'what they wrote'

- if you click such a comment in your Notifications - the commented chapter of your book will open, you'll see that comment under your chapter - & you can answer this comment ( the user who commented will get your answer - & that can be just 'comment - answer' message exchange & that's all - or you can have a longer conversation with that user in your book comments, as you want :) )