Mainnet interaction needs a damn tutorial. If you can use Metamask, you can use ZkSync. In short, send money to the ZkSync network, don't you know how to do that?
Just kidding, let's talk about the basic interaction process below.
Prepare the Metamask wallet and add the ZkSync Era network on the chainlist website:
chainlist website: https://chainlist.org/?search=zksync
Go to the ZkSync official website to start depositing, transfer ETH from the Ethereum mainnet to the ZkSync Era mainnet. Click on the Metamask wallet image to connect to the Metamask wallet -- click on the website link -- Go To Bridge -- switch to the Ethereum mainnet.
Official website: https://portal.zksync.io
It's actually that simple. Currently, the Era network has almost no ecosystem. It's still a long time away, so there's really no need to rush. Take it slow and treat it as a normal product for interaction and use.