Merge pull request ethereum-optimism#107 from ethereum-optimism/20220602-fix-getting-started

fix(getting-started): How to move to mainnet

Author: qbzzt

getting-started/README.md

@@ -310,6 +310,14 @@ The tutorial makes these assumptions:
 
 Note that in the tutorial we've been compiling smart contracts using [Waffle](https://github.com/TrueFiEng/Waffle). If you prefer to compile your smart contracts using other tools (like [Hardhat](https://hardhat.org/)) you can install the appropriate packages and modify `build` script in the `package.json` file.
 
+## Moving to mainnet
+
+When it is time to deploy your application on mainnet, follow these steps:
+
+1. Use [a bridge](https://app.optimism.io/bridge) to transfer ETH to Optimism mainnet.
+1. Where you specify the RCP endpoint URL, use [a mainnet endpoint](https://community.optimism.io/docs/useful-tools/networks/#optimism-mainnet).
+
+
 ## Best practices
 
 It is best to start development with the EVM provided by the development stack. 
@@ -319,3 +327,4 @@ After you are done with that development, debug your decentralized application u
 This lets you debug parts that that are Optimism specific such as calls to bridges to transfer assets between layers.
 
 Only when you have a version that works well on a test network should you deploy to the production network, where every transaction has a cost.
+