The simple meaning of staking is to earn money without doing any work. This is a good option to earn for those who hold coins for a long time so that then can get a income from it. Staking reward is based on the APY, it stands for "Annual Percentage Yield" means the percentage of money you will earn per year. According to this, your reward will be calculated and the APY fluctuates and it's depend on the staking platform. There is a risky side of getting scam from staking platform. So better to do some research where you are going to stake your assets. It's a very good idea to earn.