DISCLAIMER: These opinions are my own...

And this is my opinion: your book probably doesn't need content/trigger warnings, proprietary disclaimers, or copyright notices.

Copyright Notices

We'll go into more detail on copyright next chapter, but as long as you have selected ALL RIGHTS RESERVED for your book under your book's information, you don't need a whole page of your book dedicated to:

And why? It's a waste of the reader's time. People who are going to "steal" or steal your work are going to do it anyway, and 99.99% of your readers have no interest in stealing your work. It can also appear a bit uppity and overly protective, especially if your book has less than 25,000 reads. My suggestion is to worry more about people reading your book than stealing it!

Readers came by to read your story, and you might just find people skipping out on your book if you clutter it with unnecessary legality.

Content/Trigger Warnings

They usually don't need to be any longer than this:

READ THE TAGS OR READ AT YOUR OWN RISK.

Unobtrusive. To the point. If you handle a particularly controversial topic, then maybe add something more. Perhaps note if your book is Mature and why, if that's the case.

Proprietary Disclaimers

This is saying stuff like "I don't own Harry Potter!"

We all know you don't own Harry Potter. If your book is absolutely enormous in popularity, like 1M+ reads, and it's a fanfiction, it's probably best you add a disclaimer like this, just so you don't actually draw the attention of the rightsholder. However, in general, you're just taking up space by adding disclaimers like this.

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In general, keep your front matter minimal, unless you make it simultaneously fun and engaging. Casts, gifs, and music can be a fun way to introduce a story. However, even in that event be warned: people when they open a book really like to get reading, so keep it on the short side (1-2 chapters) no matter what!