TW can be beneficial in genres where it isn’t always expected. When you write some pretty dark and psychological horror and thrillers, especially those with a twist, it can be difficult to give a warning without ruining important events in the book.
There are warnings in the first pages of my books, but if you are buying them before looking inside (or just want to check) you can check out doesthedogdie.com to see what the books may possibly contain and if this will make it more of an unpleasant experience than you wanted.
Most of my writings are based on nightmares, terrifying scenarios, and dark ideas and are often rather grim. I never aim to offend, only to thrill and haunt.
If you want to know how bad a scene is, do not hesitate to comment or message me for more information.