Merge branch 'main' of https://github.com/0xPolygon/polygon-docs into di/agglayer

Author: kmurphypolygon

docs/cdk/concepts/rollup-vs-validium.md

@@ -10,7 +10,10 @@ Using Ethereum to store transaction data is generally considered the most secure
 
 Within the rollup category, there are further nuances to storing transaction data on Ethereum. Some rollups post serialized transaction data directly, whereas others post state differences instead. Some rollups use [calldata](https://docs.soliditylang.org/en/v0.8.26/types.html#data-location) to store transaction data, while others use more recent Ethereum features such as Blobs, introduced in [EIP-4844](https://www.eip4844.com/).
 
-The CDK provides full flexibility to developers to choose what to do with transaction data, including the ability to build rollups that store data on Ethereum as a rollup like the Polygon zkEVM.
+The CDK provides full flexibility to developers to choose what to do with transaction data, including the ability to build rollups that store data on Ethereum as a rollup like the Polygon zkEVM. 
+
+!!! note
+    Currently, the rollup mode of Polygon CDK does not support BLOB mode (EIP4844), but this functionality is coming soon.
 
 ## Validiums
 
@@ -61,4 +64,4 @@ Below is a breakdown of the technical differences between a zkEVM rollup and val
 ## Further reading
 
 - [Ethereum documentation: rollups](https://ethereum.org/en/developers/docs/scaling/#rollups)
-- [Ethereum documentation: validiums](https://ethereum.org/en/developers/docs/scaling/validium/)
+- [Ethereum documentation: validiums](https://ethereum.org/en/developers/docs/scaling/validium/)

docs/cdk/how-to/connect-testnet.md

@@ -0,0 +1,50 @@
+---
+comments: true
+---
+
+## Stavanger
+
+The [CDK Stavanger testnet](https://polygon.technology/cdk-stavanger-testnet) is a validium testnet based on Sepolia.
+
+- Add the RPC network details to your wallet by navigating to the add network input and entering the data as given in the table below.
+- Use the faucet to get test ETH.
+- Bridge assets from Sepolia to Stavanger using the bridge.
+- Confirm your transactions with the block explorer.
+
+!!! tips "Setting up your wallet"
+    - Click **Connect wallet** on the [Stavanger explorer](https://sn2-stavanger-blockscout.eu-north-2.gateway.fm/) to auto set up your wallet.
+    - Check out the latest on [setting up a custom network with MetaMask](https://support.metamask.io/hc/en-us/articles/360043227612-How-to-add-a-custom-network-RPC).
+
+### Stavanger network details
+
+| Name | Value | Usage |
+| ------- | ----------- | --------- | 
+| JSON RPC | https://sn2-stavanger-rpc.eu-north-2.gateway.fm | Make remote procedure calls to the CDK testnet. |
+| Faucet | https://sn2-stavanger-faucet.eu-north-2.gateway.fm | Get testnet ETH |
+| Bridge | https://sn2-stavanger-bridge.eu-north-2.gateway.fm | Bridge tokens from Sepolia |
+| Block explorer | https://sn2-stavanger-blockscout.eu-north-2.gateway.fm | Confirm transactions with the explorer |
+| Chain id | 686669576 | Chain identification value |
+| Currency | ETH | Test token |
+
+## Blackberry
+
+The [Blackberry testnet](https://raas.gelato.network/rollups/details/public/polygon-blackberry) is a zero-knowledge-powered, layer 2 testnet based on Sepolia. It uses Polygon CDK for transaction validity while keeping transaction data off-chain using [DACs](https://docs.polygon.technology/cdk/glossary/#data-availability-committee-dac). 
+
+- Add the RPC network details to your wallet by navigating to the add network input and entering the data as given in the table below.
+- Obtain Sepolia ETH from the public faucets available.
+- Bridge assets from the Ethereum Sepolia network to Blackberry using the bridge service.
+- Confirm your transactions with the block explorer.
+
+!!! tips "More information"
+    - For more information on bridging and faucet services on Blackberry, head over to the [Gelato documentation](https://docs.gelato.network/rollup-public-testnet/faucets-and-bridging).
+
+### Blackberry network details
+
+| Name           | Value                                                     | Usage                                                  |
+| -------------- | --------------------------------------------------------- | ------------------------------------------------------ |
+| JSON RPC       | `https://rpc.polygon-blackberry.gelato.digital`           | Make remote procedure calls to the Blackberry testnet. |
+| Faucet         | `https://www.alchemy.com/faucets/ethereum-sepolia`        | Obtain sepolia ETH                                     |
+| Bridge         | `https://bridge.gelato.network/bridge/polygon-blackberry` | Bridge assets from the ethereum sepolia network        |
+| Block explorer | `https://polygon-blackberry.gelatoscout.com/`             | Confirm transactions with the explorer                 |
+| Chain id       | `94204209`                                                | Chain identification value                             |
+| Currency       | sETH                                                      | Test token                                             |