solidity 1

https://remix.ethereum.org

compiler

deploy

//counter.sol

pragma solidity ^0.6.0;

contract Counter{

    uint count;

    

    constructor() public{

        count = 1;

    }

    

    function getCount() public view returns(uint){

        return count;

    }

    

    function incrementCount() public{

        count = count + 1;

    }

}

---------------------------

//easier counter.sol

pragma solidity ^0.6.0;

contract Counter{

    uint public count = 1;

    

    function incrementCount() public{

        count++;

    }

}

reference:

https://www.youtube.com/watch?v=YJ-D1RMI0T0