How will I now connect my wallet or will the wallet automatically connected main blockchain?

The Lightning Network solves these problems. It is one of the first implementations of a multi-party Smart Contract
(programmable money) using bitcoin's built-in scripting. The Lightning Network is leading technological development in
multiparty financial computations with bitcoin

Lightning enables quick, cheap and scalable Bitcoin payments. The Lightning Network scales blockchains and enables trust-minimized instant payments by keeping most transactions off-chain and leveraging the security of the underlying blockchain as an arbitration layer.