Adding new Components to a sample webpart - Tutorials?

Greetings,

I was wondering if anyone could point me in the direction of a tutorial(s) with more of a focus on taking sample webparts (from Github), and adding-to/extending their functionality. I have an odd way of learning, and I feel that something along these lines would greatly benefit me. 

If it helps... the specific sample I am looking to extend (and learn from) is the React-List-Form (https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/react-list-form) as it has a rather uniquely complex structure compared to other samples, and already has some cool functionality I'd like to better understand. The most basic concept I'd like to understand is adding a DateTime picker component, as it currently only has a Date picker component.

If anyone knows of any tutorials with more of focus on this style of learning, I'd greatly appreciate it!

Thanks,

TR