You are going to receive SO much advice, and everyone will contradict each other. The best you can do is read it all, and make your own selection and judgement.
On technique, I am happy to be a heretic and suggest you use auto exposure and autofocus until you find that doesn't produce the results you want. I think it is much more important to get out and enjoy taking pictures and learning what makes a good picture, rather than getting hung up on exposure and ISO. When you find you are limited by auto, then is the time to think about why that should be. So I have no books to suggest, except for your camera manual.
On composition, I have no rules to offer, and no books either, I can only offer my own experience:
- Get out and take photos. Do you like them?
- Look at other photographers' work, including, but not only, famous ones, old and new. Decide what it is you like about them, or not. What's the difference between theirs and yours?
- Go out and take more photos?
- Have some coffee.
- Go out and take some more photos.
- look at some paintings, film posters, advertising images, anything that catches your eye. NOW, what do you see in them, and what makes them work (or not) for you?
- Go out and take some more photos.
- ask people if you can take their photo.
- Think about the photos you've taken. But not too long.
- go out and take some more photos, then....
- Go out and take some more photos.
You get the picture. The times my photos have improved fastest have been when I have been taking photos at the fastest rate (and thought about the results). Practice is the best way forward IMHO. YMMV etc etc.
Edit: my photography books are almost all books of photographers work. Those on technique were all given to me as presents.