Whatever... Voice To Do List (free, no ads)

Simple to do list using speech to text

Enter items with microphone or keyboard

Assign priority

Check off items

Arrange items

Edit and email list

See graph of important tasks completed

Top 6 items are highlighted

I use this app myself to quickly jot down things I have to do.

I also use this along with Tree Task which I use to break down more complicated projects.

This is a very good book on to-do lists and keep in mind that my app is more of a "brain dump" but still pretty useful I think:

https://www.amazon.com/Do-List-Formula-Stress-Free-Creating-ebook/dp/B01JJ5CURW/ref=mp_s_a_1_3?ie=UTF8&qid=1549226372&sr=8-3&pi=AC_SX236_SY340_FMwebp_QL65&keywords=to+do+list+formula+book