I am java developer and new to hyperledger. I am interested in learning it and need to know where to start . fabric vs composer?
Hyperledger composer is just a framework to deploy business networks on hyperledger Fabric Blockchain. You can even deploy applications on Fabric(using chaincodes written in Golang or Node) itself but composer just simplifies the process. In composer you have Participants in your network, Assets and then you define the transactions that you want to perform. You can look into composer tutorials https://hyperledger.github.io/composer/latest/tutorials/tutorials.html