How much ATOM do you need to stake?

I'm quite curious about staking ATOM, and I'm wondering about the quantity required. Could you please elaborate on how much ATOM is necessary for staking? I'm interested in understanding the minimum threshold, if there is any, and whether staking larger amounts would bring about increased rewards or benefits. Additionally, I'm also interested in knowing if there are any staking periods or lock-up durations that I should be aware of. Your insights on these matters would be greatly appreciated.