Its not that difficult. bitcoin is plain and simple.
Bitcoin is the name of the token created under his block - chain
Block - chain is the name of the technology used to store transaction data of all bitcoin tokens.
In short, block-chain is an online ledger of transactions accessible for all people. It is irreversible.
Yeah, bitcoin is not just as difficult than we thought ago, bitcoin is not a broad topic but bitcoin is very simple and we can learn what is bitcoin easily, but the thing is how it works and how you can earn it is a much harder task to do.