What an account gives you
Read the free chapters of any book
The first chapters of every book, and where you stopped is the same on your phone.
Keep your library and your reading history
Bookmarks, the authors you follow, and how far you got, in one place, on both.
Confirm your age once
Books rated 18+ open after you have said you are an adult, and never ask again.
Locked chapters stay in the app
That is how books are kept from being copied wholesale off the web.