I enjoy making dishcloths. They’re a great way to learn new stitches which you can then apply to other projects. A bag of some kind is a reasonably sized project that’s not too complicated. Try knitty.com for some project ideas. Anything labelled mellow is fairly simple. If you get stuck on a technique, check knittinghelp.com. They have great little videos which demonstrate things far more effectively than just describing them.