But this adapter is in TypeScript. I'm using vanilla JS

Some medium posts said Token Program is like smart contract. But here you said it's the Mother contract. It's like to do some actions say transfer SPL Tokens from wallet A to B, we need to ask Mother's (Token Program) permission to do it. Right? If so, what is smart contract in Solana?

Is Token Account my wallet address? Like my Phantom wallet address?

Why do you call ERC20 Tokens as Token Mint? Do you mean a token is called a mint? Like I have 10 ETH tokens, is I have 10 SOL mints (like candy)? And Token Account is like my MetaMask wallet address? And Token Program is the MOTHER of all Token Accounts? Btw, which of the above is equivalent to smart contract?

Btw, I'm not trying to create a new USDC contract. I just want to use the existing contract at TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA on devnet So do I need const senderATA = await getAssociatedTokenAddress(splToken, sender);

Is token account like Ethereum's smart contract?

Where you got your splToken, sender values from. What are the values for splToken and sender? Is sender the wallet address? If so, what is splToken?

I just posted my code but i don;t know what I'm doing.

And how you calculated your amount? Do you do this - parseInt(amount * Math.pow(10, 6)),

And where you got your splToken, sender values from

I don't think the above is vanilla JS. But anyway, what is ATA? AssociatedTokenAddress? What is that?