What’s the difference between the Ethernet mainnet, testnet and sidechain?
The mainnet is the network node where Ethernet runs, and it is real data.
The test network is for development and testing, and the ehter on it has no value.
Sidechain: Because of the limited resources on the main network, slow block speed (generally 12 seconds to generate a block), high transaction fees gas and other issues, so there is a sidechain. Sidechain is based on the main network expansion out of the Layer2 blockchain technology, in the above transaction consumption gas lower, with the main network can have a certain interaction.