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receiver.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.25;
+
+contract receiveETH {
+    event Log(uint amount, uint gas);
+
+    receive() external payable {
+        emit Log(msg.value, gasleft());
+    }
+}

sender.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.25;
+
+contract sendETH {
+  // 1. pay the contract once its deployed
+  constructor() payable { }
+
+  // 2. directly sends to the contract
+  receive() external payable { }
+  // or
+  // 3.
+  fallback() external payable { }
+
+
+  // 3 ways to send ETH
+  // 1. if function call fails the transaction will fail
+  function sendViaTransfer(address payable to) external payable{
+    to.transfer(123);
+  }
+
+  // or
+  // 2. returns boolean value to indicate if the transaction was successful or not
+  function sendViaSend(address payable to) external payable{
+    bool sent = to.send(123);
+    require(sent, "tx failed");
+  }
+
+  // or
+  // 3. forwards all gas, returns a boolean and data
+  function sendViaCall(address payable to) external payable{
+    (bool success, ) = to.call{value: 3000000000000}("");
+    require(success, "call failed");
+  }
+}