In the real world, we used fiat or physical money in our daily spending. And this physical notes can be use in fraudulence or a so-called Fake Money.
How about in Cryptoworld, is there also a Fake Bitcoin? If there's any, how can we identify it?
Al altcoins are Facke bitcoin, because they take the bitcoin source code and create new coins.
All the Forks are fake bitcoin too because they take the main blockchain and split it while getting a new coin.
Even we have fake satoshis, some users claiming they are satoshi. So, just don't believe everything you read

Nope.
Altcoins are not fake bitcoins, some are genuine and unique projects, especially if they have there own chain from block 1 (0).
A code fork is not necessarily a chain fork off of bitcoin.
See: "Topic: The paradox of Bitcoin Cash"
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https://bitcointalk.org/index.php?topic=4663094.0and I quote satoshi ...
"
A second version would be a massive development and maintenance hassle for me. It's hard enough maintaining backward compatibility while upgrading the network without a second version locking things in. If the second version screwed up, the user experience would reflect badly on both, although it would at least reinforce to users the importance of staying with the official version. If someone was getting ready to fork a second version, I would have to air a lot of disclaimers about the risks of using a minority version. This is a design where the majority version wins if there's any disagreement, and that can be pretty ugly for the minority version and I'd rather not go into it, and I don't have to as long as there's only one version.
I know, most developers don't like their software forked, but I have real technical reasons in this case.
...snip...
and no I'm NOT satoshi.