So you buy a nice two shelf bookcase but it’s wobbly and you know it won’t hold much. I’ve recently gotten one and my solution was to put L-brackets on it. After installing about 8 of these brackets at the cojoining parts of the shelving, it is now completely stable and ready for use.
I’ve had a $60 Ryobi drill for 10+ years. The battery and the drill work just fine. For basic maintenance, I would rate a cordless drill in my top 5 tools - up there with a hammer and tape measure.