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Is it possible to send testnet eth from one testnet network to another?

No, it's not possible. However, Ethereum test networks differ in consensus mechanism. Ropsten is a Proof of Work (PoW) Test network, while Kovan, Goerli and Rinkeby are Proof of Authority (PoA) Test ...
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Which Ethereum testnet will be supported after the merge (Paris/Bellatrix)?

The Ethereum core developers decided that the following testnets will be maintained in the future, including the merge: Sepolia Testnet (PoW), chain ID 11155111, https://sepolia.dev Goerli Testnet (...
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Is it possible to send testnet eth from one testnet network to another?

No that's not possible since they are independent. ETH are minted as a reward for miners and therefore always stay on the chain they were minted for. (It could be that there is some kind of bridge for ...
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Where can I find test-ether for the Kovan Test Network?

Currently the most reliable method is through https://faucets.chain.link/ which provides .1 KETH per 24 hours. The manual gitter sent me .001, which is more of an insult than anything. Did not try ...
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Rinkeby offline

Sometimes the testnet faucet undergoes maintenance or is overloaded with requests. You should try using Chainlink's Rinkeby faucet: https://faucets.chain.link/rinkeby Note: this faucet just worked for ...
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Can I detect if my solidity contract runs on testnet/ganache or mainnet?

According to the docs https://docs.soliditylang.org/en/v0.8.13/units-and-global-variables.html you can also get the chainId using the global block variable uint256 chainId = block.chainid;
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Creating an efficient development enviroment + workflow for dApp development

Perhaps you should consider using Hardhat. It may be challenging to learn it at first but it comes with amazing plugins for deploying contract, debugging, checking transaction price, ...
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Error: network does not support ENS

This might be the same problem here. The address that you use might be invalid (e.g. space/numbers accidentally added to address). In this case, your smartcontract address is invalid
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