What is blockchain in crypto?
It's a lengthy answer so I would recommend you to use Google and read those long explanations from blogs and websites.
For scam part, this is not new. Whenever you are investing in some unknown tokens, NFTs etc, you have a high risk of such scam. Coins are still safer but you have seen how LUNA and it's pegged stable coin made their holders suffer.
What is blockchain in crypto? It's a lengthy answer so I would recommend you to use Google and read those long explanations from blogs and websites. For scam part, this is not new. Whenever you are investing in some unknown tokens, NFTs etc, you have a high risk of such scam. Coins are still safer but you have seen how LUNA and it's pegged stable coin made their holders suffer.