You should use Google to know how staking system works. Here is a explanation from the Coinbase.
What is staking?
Staking is the process of actively participating in transaction validation (similar to mining) on a proof-of-stake (PoS) blockchain. On these blockchains, anyone with a minimum-required balance of a specific cryptocurrency can validate transactions and earn Staking rewards.
How does staking work?
When the minimum balance is met, a node deposits that amount of cryptocurrency into the network as a stake (similar to a security deposit).
The size of a stake is directly proportional to the chances of that node being chosen to forge the next block.
If the node successfully creates a block, the validator receives a reward, similar to how a miner is rewarded in proof-of-work chains.
Validators lose part of their stake if they double-sign or attempt to attack the network.
Hope you understand. But be careful about scammers. There are many fake staking systems and all staking platforms aren't the same. For example, Yobit also allows you to stake various coins with a high return. But most probably it's a Ponzi scheme behind of staking system. So you should know which is a real stake and which is a fake stake to save your assets.