If you are interested to how to create erc20 token using smartcontract then give this article a try.
In common, what do you mean by ERC20 token creation?
In ethereum blockchain, the ERC20 tokens are created using the agreement called smart contracts. The algorithm used for the creation is ERC20. The smart contracts are nothing but the execution code built on the ethereum functions and they are written using the language called solidity. Ethereum and ETH tokens are stored on the digital storage space called Meta Mask.
First step: Coding
The initial step in ERC20 token creation is developing a code structure for the entire supply. The codes can be are written on your own if you are a developer or else it can be executed by the good expertise companies.
Since the coding needs to be done with the solidity language it is preferable to hire experienced developers. Once you have done with the code structure, you can change the characteristics of the token on your requirements. You can name them and set supply units.