I think he is simply want to know how to create one for him to scam others, I don't think creating a fake transaction can be a kind of school project, that just make me laugh,
anyway I think the reason why the OP is newbie is for him to not get detected for the scam we wanted to do, I think he want to create a fake transaction for the purpose that he send something to someone and post it in the social media so he can attract victim.

The correct answer is NO, but some people create their own so-called Crypto currency investment site and then they connect that site with their own internal ledger with fake coin tokens. <Not tokens on the Blockchain> The investors are oblivious to the difference, so they think they are buying actual coins.

Usually these sites do not allow people to withdraw actual coins, but you can sell your fake tokens and withdraw the cash. They charge trading fees, when you sell fake tokens on their internal ledger as if you were buying and selling real Crypto currencies. 

You cannot send a "fake" Bitcoin transaction that you have. Majority of the network runs the reference client which also follows the protocol rules. With that in mind, the nodes will reject and refuse to propagate any transaction that doesn't follow its rules. The main rules is that the transaction must have a valid signature which would provide the proof that the UTXOs are authorised to be spent. In addition, its also not possible to fabricate a transaction with fake inputs since the inputs must be in the UTXO list of the individual nodes.

Really? How can one send fake transactions to bitcoin?

Fake is a loose word, and under some definitions fake transactions can be possible. Double-spending can be considered one such example - there are multiple ways to do it. The first type is unconfirmed transactions - like their name suggests, they are not final, and scammers can trick unexperienced people into accepting them, and then abandoning those transactions by making competing transactions that spend the same coins get accepted in the block. The other type is a double-spend attack with chain reorg - this reverses all latest transactions, even if they are included in blocks, but to this day this attack remained theoretical in Bitcoin (but not altcoins), because Bitcoin is protected by PoW.

Of course that is impossible, bitcoin uses blockchain, and the blockchain is the biggest journal that anyone can see. So how can you do a fake transaction.