How much HBAR do you need to stake?

Could you elaborate on the requirements for staking HBAR? Specifically, what is the minimum amount of HBAR one needs to possess in order to participate in staking? Is there a recommended threshold or is it purely based on the individual's preference? Additionally, are there any additional factors to consider, such as staking duration or potential rewards, that influence the decision on how much HBAR to stake? Clarifying these details would greatly assist individuals interested in participating in HBAR staking.