It all depends on the algorithm itself. If the developer of a coin wants to implement POS algorithm, you will be able to stake. For example, ETH is now a POW coin so you can mine it. But in 2022 (hopefully) they will be moving to POS mechanism, so you will be able to stake the coin and won't be able to mine it using your computing power.
What many people were hopeful about ethereum 2.0 was that people will be able to stake ethereum and also pay low transaction fee, but now still getting longer and ethereum fee is very high like nothing has been changed. Let us hope ethereum will finally move to PoS by 2022, but just that PoW is far better than PoS as the equipment used for mining are bought and help the companies producing the equipments to also gain unlike PoS that only deals with staking.