guitar1580
Josh, something you and many others have forgotten to mention is the type of gun you're referring to. Some folks are answering your OP with the care and feeding they give an O/U and others are talking about stick guns. If you have questions about a specific gun, your first source of info should be your owners manual. There will be a section on cleaning and disassembling. If you don't have a manual, google-up a copy of one. Without a manual, you may be unaware of safety precautions specific to your gun.
BigJimP likes to take his Benelli autoloader apart because it's construction facilitates easy take down (and it's interesting inside). I'm on the other end of the spectrum, my auto-loader trigger groups stay in place until they act up. Ask my friend, BigJim, how often he opens up the guts of his brace of Browning O/Us just to clean the triggers and I suspect he'll give you a different answer.
My P-guns all have push-button drop out trigger assemblies. The only time they are coming out during a routine routine range wipe-down is if they've been wet from rain or sweat. This is a good time to mention climate. Obviously, BigJim and I have developed different cleaning habits because he's perpetually facing the wet weather of the Great Pacific Northwest and I'm shooting in arid SoCal. These different environments require different levels of care.
Watch the comp shooters. Typically, they have a lot more invested in their guns and shoot a lot more than the average shot-gunner. After an event, you'll see them at the back of their trucks tending to their toys. They want them clean, but without unnecessary disassembly. There's no reason to wear out push pins and screw heads before their time.
Most comp shooters transport their guns broken-down and cased (because that's the way they came). It's a matter of habit: 1. Remove the barrel and forearm. 2. Give everything a quick once over (typically using sprays, rags and a bore brush/swab) then, 3. Return the sub-groups to the case. Removing smaller parts is best left until you get the gun over a bench instead of a tail gate. More than once I witnessed some poor shooter have a part get away from him and vanish forever into the parking lot gravel.
It's when the gun is reassembled, prior to shooting, that the comp shooter takes special care to make sure the friction points are given a fresh coat of lubricant, and any excess is wiped from the exterior. We go through all of this for several reasons, to: 1. Stop corrosion (inside and out); 2. Keep the internal tiddley-bits operating smoothly; 3. Prevent galling at the stressed pivot and lock points; and 4. Reduce the accumulation of crud.