To understand the core principles of Scrivener, let's compare and contrast.
Word/Docs
Scrivener
Literature & Latte's Getting Started - Scrivener's Core Concepts (1.5 mins)
Scrivener is extremely flexible and customizable. Everyone uses it differently.
You don't have to understand all the features the start using Scrivener. You don't need to read the entire manual.
Start out with the features that make sense to you and gradually learn more about them and start using them.
Use Scrivener in whatever way seems useful to you. As you become more comfortable, how you use Scrivener will change over time.
At first, the features of Scrivener can be overwhelming and the interface may seem busy and distracting. (It's easy to minimize features and change views.)
it's not all or nothing with Scrivener! You don't ned to completely master it to use it effectively. It's okay to go back and forth from Scrivener to Word. Most people do when they start exploring Scrivener. (Copy & paste between software or use Scrivener's import & split or compile features.)
It's common to give up on Scrivener and then return to try it again before being able to fully commit. Sometimes more than once!
Be prepared--Scrivener will change your writing process.
In short: use Scrivener in whatever way seems useful to you. How you use Scrivener will change over time, as you develop more comfort.