The Highway Code and Driving the essential skills are both key resources you really do need to read.
The Highway Code sets out the rules you need to know and are expected to follow.
Driving the essential skills is a very important key text if you are learning to drive or training to become an Approved Driving Instructor (ADI). It is easy to read and covers the subjects you need to know about.
I use Desktop driving for my resources. Over many years I have found their service to be excellent and they are substantially cheaper than other retailers.
https://www.desktopdriving.com/
Learning to drive an automatic car and full licence holder driver training
https://www.alistairstuartdrivertraining.co.uk/
Driver instructor training for Parts 1, 2 and 3 of the qualifying examinations to become an Approved Driving Instructor (ADI)
https://www.alistairstuartdrivertraining.co.uk/driving-instructor-adi-training
