Here are the basic steps to write a smart contract on Solidity:

Set up a development environment: You will need a development environment like Remix or Truffle to write and test your Solidity code. Remix is an online Solidity IDE, while Truffle is a more powerful development framework that includes tools for testing, deployment, and more.

Define the contract: Define the structure of your contract in Solidity. This includes naming your contract, declaring its state variables, and defining its functions.

Write the code: Write the code for your smart contract in Solidity, using the appropriate syntax for Solidity.

Compile the code: Once you have written your code, compile it using a Solidity compiler. Remix has a built-in compiler, while Truffle relies on the solc Solidity compiler.

Test the contract: Test your contract to make sure it behaves as expected. You can use testing tools like Mocha or Chai, or you can test your contract manually by interacting with it in Remix or on the Ethereum blockchain.

Deploy the contract: Finally, deploy your contract to the Ethereum blockchain using a tool like Remix or Truffle. You will need to pay a fee in Ether to deploy your contract, so make sure you have enough funds in your Ethereum account to cover the transaction fees.

Remember to also follow best practices for writing secure and efficient smart contracts, such as using the latest version of Solidity, avoiding unbounded loops, and thoroughly testing your contract before deploying it to the live blockchain.