>>353537950mm f1.8 STM. Dirt cheap and great for low light/bokeh. The kit lens is also fine for most things if you want to save the money. You're not experienced enough to reach the limits of the kit lens, you're just itching to buy gear because you think it's a shortcut to get better photos when real life experience will serve you more.
Don't bother buying a book, you probably won't bother to read it. Put the Canon into aperture priority mode and focus on that. It'll fall into place from there.
