For you, my best recommendations are to stick to your smartphone, learn some simple composition tricks and if possible, use some easy to use apps. The smartphones that have the best image quality these days are as follows:
Besides your smartphone, I highly recommend you start using an app to enhance your images. Simple things like straightening a tilted horizon, cropping or fixing colors can make a huge difference to your images. There are tons of apps on the iTunes store as well as on Google’s Play store. I recommend Google’s Snapseed. You will find it very easy to use. Here is a quick tutorial for using Snapseed.