Which Ethereum network to use?

So, the question is, "Which Ethereum network should I use?" Well, it really depends on what you're looking to accomplish. If you're just experimenting or developing a new project, the testnets, like Ropsten or Rinkeby, are great options. They allow you to test your code and smart contracts without spending real money. But if you're looking to deploy a live application or transaction, you'll need to use the mainnet. The mainnet is the real, live network where all the real value and transactions occur. However, it's important to note that using the mainnet requires real Ether, which can be expensive and volatile. There are also some alternative networks, like xDai or Polygon, that offer faster and cheaper transactions while still being connected to the main Ethereum ecosystem. These can be great options for certain use cases, but it's important to do your research and understand the trade-offs before choosing one. So, the question really is, what are your needs and goals? Once you have a clear understanding of that, you can choose the Ethereum network that best fits your requirements.