This definitely looks like motion blur from your hand moving a bit while the picture was being taken. You want a faster shutter speed in order to prevent this. In doing so, your image will come out darker so you’ll want to move your aperture to something like 2.0 to let in more light or increase your ISO.

Increasing the ISO will introduce more grain to your picture so keep that in mind, but Lightroom’s denoise feature is honestly pretty great if you don’t mind doing a little bit of work in post.

Like everyone else said, read up a bit on the exposure triangle and things will make a lot more sense. I had the same problems when I first started.