More clarification on sane miniscript and valid miniscript

I was conducting research and, at the same time, studying to understand more about the smooth running of bitcoin. I came across a content miniscript. Reading deep in it, I came across two types of miniscript, which are sane miniscript and valid miniscript. Although I read and understood a bit of it, I knew that sane miniscript is a scripting language that was also created for the simple and enhanced flexibility in the creation of bitcoin transactions, and it also allowed users to create complex spending conditions for their transactions in a more simple and reliable way. While a valid miniscript focuses on or adheres to the rules and syntax of the miniscript language, valid miniscripts are used to define the spending conditions of transactions. These conditions can include some requirements like multi-signature approval, time lock, etc. I hope I am not going out of the box, but just going on the way.

The main reason for creating this thread is to understand more and also to know the advantages of both the sane miniscript and the valid miniscript. I know I will have more explanations from other intellects.