@bomjacob. I've made all the changes as requested.

is it possible to return different routes?
let's say 2 buttons inlinekeyboard
press 1 return third route
press 2 return forth route

It might be possible, but I'm not sure yet.

It looks okay to me. But I have some questions/additions I would like to see.
First of all, the conversation is never ended. I would prefer if you return ConversationHandler.END at the end of second.

Secondly I do agree with @vr2xiq that it would be nice if the example would show a keyboard with a choice. So for example on start you have a choice of two buttons (1 and 2)
When selected 1 you will have a new choice of 3 and 4, and when selected 4 you will have a second choice of 4 and 2 (just an example)
This will have a more elaborate view on CallbackQqueryHandlers in a ConversationHandler and will have to use the pattern argument to discern between them.

You think it's possible for you to adjust the example that way?

@Eldinnie I have added the ConversationHandler.END at the end of second.
For the keyboard which provide two or more choices, I will work on that ASAP. Till then we can merge this example so other developers can use the example to build awesome bots. Thanks

@bomjacob @Eldinnie
I see there are commits following your review. Can you please check if we can merge it?