Yes, Tezos is intended to be a "store of value" and investing in Tezos is a great way to secure your wealth. You don't have to lock up your stake, but you do have to hold it in order to benefit from the rewards that come with staking. When you stake your Tezos, you are essentially lending your coins to the network in exchange for rewards. This provides the network with additional security and allows it to process transactions faster. The rewards you receive from staking depend on the amount of Tezos you stake, the amount of time you stake for, and the amount of rewards that are available. The more Tezos you stake, the higher the rewards you can receive. Holding Tezos for a longer period of time will also increase the rewards you receive. Staking is a great way to secure your wealth and benefit from the rewards that come with it.