A few weeks ago I started learning web development in order to later jump into Solidity and create my first dApp.
After following some HTML/CSS/JS tutorials, last week I started watching a Beginners Solidity Course and deployed my first "Hello World" smart contract on Mumbai Network, the Polygon testnet.
Nothing special, just a short smart contract where you can check a string in the state memory of the contract or change that string value paying the transaction cost.
You can directly check the code in testnet polyscan
And play around with it using the Read Contract and Write Contract buttons. The Read tab shows you what's stored in the contract variable, it has no gas cost to check, but if you want to change the content using the Write Contract tab, you will have to connect your wallet on Mumbai and pay for the transaction
If you feel like trying it yourself, you can follow the free youtube beginners' tutorial from Hashlibs.
Have fun!