How to quickly encode and decode things. For more, check here: https://docs.soliditylang.org/en/v0.8.10/units-and-global-variables.html?highlight=abi.encode#abi-encoding-and-decoding-functions

EncodingFun.sol

// This example code is designed to quickly deploy an example contract using Remix.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract EncodingFun  {
  function encodeThenDecode(uint256 value) public pure returns (uint256) {
      bytes memory encodedData = abi.encodePacked(value);
      uint256 decodedData = abi.decode(encodedData, (uint256));
      return decodedData;
  }
}