It should be Raw Amount in token's decimals. This means amount should be how much of that token you have.

When buying: amount of sol lamports. solana has 9 decimals, so if you want to buy 0.1 sol of the target token you need to input 0.1 x 1_000_000_000 = 100_000_000

When selling: amount of how much token you have. for example you have 435.54 $some token. and token decimal is 6. so 435.54 x 1_000_000 ( 6 zeros, because token's decimal is 6.