Am I on the right track ??

Hello I am new in web3 and learning about the ethereum and web3 to build a project for hackathon and here is the rough understanding that I have

“` So the first thing you do is create a dapps or whatever solution you creating and then you use a testnet to check your smart contract like is it working fine or not and then you connect your wallet and check the gas fees that you will pay based on the complexity of the project and then either you deploy it on the layer 1 ethereum mainnet or layer 2 like polygon

“`

I would love to have some feedback on it.