I'll explain what I mean and the situation:
- let's assume that I have ETH, some other tokens and also USDC all on the ETH network (perhaps on the ledger or metamask connected to the ledger)
- let's assume that in the future I wanted to sell ETH for USDC/USDT or vice versa
Is it better to pass everything on a L2 like Optimism, Arbitrum? Better another L2? and if so, which one and how do I do it safely (considering all the various exploits on bridges and more, I wouldn't want to risk more than the usual)?
And once you get to L2, which DEX to use that takes advantage of this L2?

Another related situation:
- let's assume that I liquid stake ETH on LIDO and therefore obtain stETH as a token on the ETH network
I can also bring this new token to a L2, right? but how does it work regarding rewards? Will I continue to receive them? on which network? is it worth it?
-> I already aswered this by wrapping stETH I guess