In early 2019 Google I/O introduced an improved version of Material Design, in this new release some components has been refreshed and some some otherhas been introduced. One of this brand new elements is the Modal bottom sheet.
What’s a modal?
A modal dialog is a dialog that appears on top of the main content (a layer above it) and moves the system into a special mode requiring user interaction. This dialog disables the main content until the user explicitly interacts with the modal dialog.
If originally they were used to alert users (to an error or to some other system state that required immediate user action) and placed in the middle of the screen, now they use is evolved, and modal dialogs are used most often to provide contextual action or to attract user attention on a specific task.
So what?
Here is a list of DO and DON’T about bottom sheet modals.
DO
Use modals for contextual information, such as deep links to another app.

DON’T
Open modals in full-screen, this places the top content out of reach for users.

DO
Use modals instead of menus to present additional screen actions.

DON’T
Don’t use an invisible scrim for modal bottom sheets. This can mislead users about their ability to interact with the rest of the screen.

One more thing
Most important, don’t forget to get to users a great escapes, as Linzi Berry wrote here.
See you soon, thanks for reading.
