Although I've been learning about bitcoin,
I still need some experts to help me understand :
You don't need an expert. None of these are expert topics, these are all basic concepts.
a) wallet
A wallet is a collection of private keys and their associated bitcoin addresses. Most wallets also provide a user interface that calculated the total value of bitcoins that you control and that makes it easier to create and broadcast transactions to assign some of that value to other addresses.
These are a variety of charts that display data about bitcoin in a way that makes it easier to comprehend and easier to see trends.
c) vanity address
These are bitcoin addresses that happen to have a pattern of characters in them that some people find interesting.
Are you an expert ?
Probably not.
Can I have a skype chat with you to understand the above issues ?
No. I don't use skype at all. If you want to visit the Chicago area, I'd be happy to meet up with you for a coffee or a meal and discuss any concepts you might be struggling with.