Revert Sepolia references back to Goerli for NFT hosting capability

Author: elPiablo

pages/lessons/projects/2.mdx

@@ -309,7 +309,7 @@ going to use them inside our contract.
 ## Standing on the shoulder of giants
 
 For this we are going to ‘inherit’ (think of _using the properties of_ or
-_extending_ for now) the ERC721 contract from OpenZeppelin. Or the same way you
+_extending_ for now) the ERC721 contract from OpenZeppelin, or the same way you
 _inherit_ the DNA and characteristics from your relatives.
 
 ![standing.in.the.shoulder.of.giants.nft.jpeg](/assets/lessons/2/img_5.jpeg)
@@ -763,10 +763,8 @@ This is the output i got:
 
 ![deploy.output.png](/assets/lessons/2/img_16.png)
 
-Notice that ‘Compiled 11 Solidity files successfully’? But we only wrote 1
-Solidity file!
-
-Well, we are actually inheriting some of OpenZeppelin's implementations, so the
+Notice that it ‘Compiled 10 Solidity files successfully’, but we only wrote 1
+Solidity file! Well, we are actually inheriting some of OpenZeppelin's implementations, so the
 compiler also has to process everything we are importing in our contract.
 
 Since we are in a development environment, Hardhat provides us with the tools to
@@ -820,7 +818,9 @@ For us to get our contract out of our computers and into the real world, we are
 going to run the deploy again, but this time to a testnet.
 
 What is a testnet? It is a basically a whole running blockchain, but it runs
-only so people can try stuff out. On it, you have ETH, NFTs, other tokens, etc but they have no monetary value. This way, you can develop and test your contracts without fear of losing anything valuable. For the moment, we are choosing to do this on *Sepolia*. It's one of the many of Ethereum testnets.
+only so people can try stuff out. On it, you have ETH, NFTs, or other tokens but they have no monetary value. This way, you can develop and test your contracts without fear of losing anything valuable. For the moment, we are choosing to do this on *Goerli** testnet. It's one of the many of Ethereum testnets. 
+
+ * We had wanted to use the Sepolia testnet, because Goerli is going to be deprecated by the end of 2023, but we're temporarily restricted, because there isn't yet a compatible NFT test hosting site for Sepolia. We will update the lesson accordingly when this availability arrives.
 
 Before we go any further, let's take an extra step for precaution. In the
 next project we'll learn how to use collaborative tools to store
@@ -833,13 +833,14 @@ hardhat.config.js
 
 In order to deploy to a real testnet we'll need:
 
-- An Ethereum wallet that can connect to Sepolia
+- An Ethereum wallet that can connect to Goerli
   [Metamask](https://metamask.io/) is often used
-- Some Sepolia-ETH. You can ask for some in a faucet, it's free, although
-  some are faster than others! Options: [#1](https://faucet.sepolia.dev/),
-  [#2](https://www.infura.io/faucet/sepolia), [#3](https://faucet.quicknode.com/ethereum/sepolia)
-- An API Key from an Ethereum RPC Node Provider e.g. [Infura](https://app.infura.io/),
-[Ankr](https://www.ankr.com/rpc/eth/eth_sepolia/), or [Alchemy](https://dashboard.alchemy.com/)
+- Some Goerli-ETH. You can ask for some in a faucet, it's free, although
+  some are faster than others! Options: [#1](https://goerlifaucet.com/),
+  [#2](https://faucets.chain.link/goerli), [#3](https://faucet.paradigm.xyz/)
+- An API Key from an Ethereum RPC Node Provider
+  ([Alchemy](https://www.alchemy.com/), [Infura](https://infura.io/),
+  [Ankr](https://rpc.ankr.com/eth_goerli))
 - A minor change in the Hardhat configuration file
 
 First and foremost, **security**. We are exploring new grounds, experimenting,
@@ -865,7 +866,7 @@ blockchain network. Once you have your wallet funded with test ETH, you'll need
 Ethereum RPC Node Providers. Alchemy and Infura are the most used. And Ankr has a 'community endpoint' which doesn't require a dedicated sign up, to list a few options.
 
 After signing up, you'll be asked to create an App. Be sure to select the
-Sepolia network there. When the app is created, you'll see a 'View Key' button, or similar. Press it
+Goerli network there. When the app is created, you'll see a 'View Key' button, or similar. Press it
 and copy the HTTP link, we'll use it in our next step.
 
 With our wallet funded fake ETH, we can go ahead and change our
@@ -888,7 +889,7 @@ const RPC_API_KEY = 'YOUR-API-KEY-FROM-INFURA-OR-ALCHEMY'
 module.exports = {
   solidity: '0.8.12',
   networks: {
-    sepolia: {
+    goerli: {
       url: RPC_API_KEY,
       accounts: [WALLET_PRIVATE_KEY],
     },
@@ -912,6 +913,7 @@ Please, if you are already a developer and you plan to use Git to store your
 project, don't store your `hardhat.config.js` on it, because you will have your
 private key there.
 
+
 <SideDrawer buttonText="Checkpoint Questions" title="Adopting Wise Developer Practices">
       <Question question="lesson-2/7-connect-real-world/Q1" />
       <Question question="lesson-2/7-connect-real-world/Q2" />
@@ -921,7 +923,7 @@ private key there.
 </SideDrawer>
 <br/>
 
-Ok. We are ready, let's deploy to the Sepolia testnet!
+Ok. We are ready, let's deploy to the Goerli testnet!
 
 Now we need to run our deploy.js script and the deployment is going to cost us
 some ETH - test ETH, don't worry - from our wallet, since we are storing
@@ -933,7 +935,7 @@ deploy, delete all the lines we added to test the minting.
 Run:
 
 ```bash
-npx hardhat run scripts/deploy.js --network sepolia
+npx hardhat run scripts/deploy.js --network goerli
 ```
 
 This is the output i got in my console:
@@ -947,25 +949,26 @@ Now that we have run the deploy script, **delete the private key and the RPC API
 key from `hardhat.config.js`** to minimize the handling of the wallet. In the next
 project we will learn about tools to collaborate and store your projects online.
 
+
 So now we can go and explore the chain to find your contract (and mine too!).
-Just go to [Sepolia Etherscan](https://sepolia.etherscan.io/) (or
+Just go to [Goerli Etherscan](https://goerli.etherscan.io/) (or
 [Opensea](https://testnets.opensea.io/)) and search for the address of our
 deployed contract.
 
-You can view my links as an example on [Sepolia Etherscan](https://sepolia.etherscan.io/address/0xc2c2Ae7Ba222384352ED022D8D1b53Ee7edc52AB)
+You can view my links as an example on [Etherscan](https://goerli.etherscan.io/address/0x166A82F7cD8F7BA9D8C10b2cc792C1A20084564d)
 and [Opensea](https://testnets.opensea.io/collection/d-d-academy)
 
 ![opensea.png](/assets/lessons/2/img_20.png)
 
-Wow, you have created your own NFT collection from scratch. What a superstar! You have learned tonnes of new concepts and code - that is really impressive! And now you're almost ready to test yourself a little bit more. 
+Wow, you have created your own NFT collection from scratch. What a superstar! You have learned tonnes of new concepts and code - that is really impressive. And now you're almost ready to test yourself a little bit more. 
 
 But first, we want you to breathe and enjoy. So go and 'touch some grass', and when you come back after your well earned rest, take the quiz.  <br/>
 
 <br/>
 <Quiz quiz="lesson-2-quiz" />
 <br/>
 
-Congratulations on your results. You're now a supreme open-sourcerer! In the next lesson *tiered NFTs*, you will be building on top of what you did here, adding more functionality to your contracts and to your knowledge of creating ERC721s. After that we'll be doing some automated testing, and to wrap up, we'll be connecting everything up to a front end, so a user can easily interact with your creations. Lots of fun in the pipeline! See you in the next one and in our community [developerdao.peeranha.io](https://developerdao.peeranha.io)!
+Congratulations on your results. You're now a supreme open-sourcerer! In the next lesson, *TierNFTs*, you will be building on top of what you did here, adding more functionality to your contracts and to your knowledge of creating ERC721s. In the project after that, you'll be creating automated tests for your smart contracts. And to tie everything together, you'll be building a front end, so a user can easily interact with your creations. Lots of fun in the pipeline! See you in the next one and in our community [developerdao.peeranha.io](https://developerdao.peeranha.io)!
 
 
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