To be quite honest, this is the first time I've heard of crypto stacking. The only place I've ever started is with domain name authority stacking. You may use various tactics to increase the value of a domain name on Google and hence rank for more keywords.
Crypto staking is a well-known platform where you could earn a fixed income if you stake coins. They provide profits based on percentage every month. Polkadot is one of the most profitable coins to stake.