I shoot mainly in manual mode. Can someone tell me what your auto focus settings are? I feel like I have something wrong. The lens I'm using is a 24-120mm. Thanks
AF-S is single-servo mode. Generally if you shoot in AF-S, you will want to use single-point autofocus. AF-S focuses once when you half press your shutter, and does not refocus. It's for portraiture, landscape, still photography, etc.
AF-C is continuous-focus mode. It's for sports, wildlife, and other moving subjects. There are many different settings for AF-C. Each one is useful. I use a mix of 3D-tracking, single-point, the 4-point cluster, 21-point, and full autofocus. Generally if I'm seriously trying to get a photo of a tough to target bird, I'll use 21-point, or the 4-point cluster.
AF-A is a combination of AF-S and AF-C. I never use it.
In your camera, in custom settings -> autofocus -> focus tracking with lock-on, there are a few choices. You can shoot 5, 4, 3, 2, 1, or off. This setting applies to AF-C mode. If you choose "5", the camera will delay refocusing onto a new focus point. If you choose a smaller number, that delay is shorter. If you choose off, the camera will switch to a new focus point as quickly as possible.
On your camera, you can change your autofocus settings by using the little AF, and M switch. There's a button, and if you press it, you can use your dials to switch from AF-C, AF-S, AF-A, and you can use the other dial to switch your focus point types.
The "M" on the dial stands for manual focus. It is not the same as manual exposure mode.