Instructions for adding a network to the Metamask wallet
To add a network you need to do the following:

Click on the user profile in the top corner of the page
Go to the "Settings" tab
In the tab that opens, select "Networks" from the menu
Select "Add network"
Fill in all fields in the tab that opens
Save network
After saving the network, it will appear in the list. You can also add other networks on our resource.

List of available networks:
Ethereum Mainnet is the main Ethereum crypto network.
Rinkeby Testnet is a test Ethereum crypto network.
Kovan Testnet is an Ethereum test crypto network.
Ropsten Testnet is a test Ethereum crypto network.
Binance Smart Chain Mainnet is the main network of Binance Smart Chain.
Binance Smart Chain Testnet is a test crypto network of Binance Smart Chain.
xDai Mainnet is the main crypto network of xDai Chain.
xDai Testnet – test crypto network xDai Chain.
Polygon Mainnet is the main Polygon crypto network.
Mumbai Testnet is Polygon’s crypto test network.
Avalanche C-Chain Mainnet is the main Avalanche crypto network.
Avalanche X-Chain Mainnet is the main Avalanche crypto network.
Avalanche Fuji Testnet is the Avalanche crypto test network.
Fantom Mainnet is Fantom’s main network.
Fantom Opera Testnet – Fantom test crypto network.
All of the listed cryptonetworks are the same and can be easily added using the instructions mentioned above.

Stay tuned as new networks may be added to this list over time.