The Ethereum 2.0 just started, with the Beacon Chain, so since now, mining ether is based on PoS consensus, instead of PoW. The first goal is solving the scaling-issues, increasing the transaction-per-second rate. Ethereum is a platform, that can host dapps, build from smart contracts, so actually any operation inside a dapp, could be a transaction.
The ETH2.0 released the sharding, with this, there will be many sidechains next to the main chain, each of them with separated computing processes. The main chain will record and store the transaction history, but the work will be done by the sidechains, by the shards. Unfortunately, the full capacity operations could be delayed over a year, until then, we can use the new system in half-steam.