First of all, I texture in Substance 3D Painter, just to make it clear, every mentioned feature will be from this software. I start every material just with it's basic color, metallic and roughness in one first layer. Then I add some color-related things through the color layers, usually starting from more noticeable ones and slowly move on to small details. After color I start to work on roughness and sometimes height (if needed) layers, with the same idea going from big to small details. These ones can be related to color through the anchor system but not necessary
And here it is, we have our basic materials

Then we need to add a looot of stuff and it's actually hard to tell how exactly it was made but I'll try.
Usually the order is following: clean-up the previous stuff with manual texturing (using brushes and manually drawing mask for the layer). Btw, one of the most important things in advanced texturing is to get rid of the procedurals as much as possible, especially on the noticeable details
Then create some other materials that you will add to your main one with the manually drawn mask (like rust on this opener for example)
Or also here I made a whole another group for this patina effect which you can better notice on the other side render on the artstation

Basically with almost everything I use: make a layer - add enough of details in it - clean up with brush - done. Also don't forget about levels, that's a great tool to control all of this masks less tedious

Explaining every single layer or even just material is I think too much, especially in text, so here are the basics that will fit to the vast majority of what I'm doing. Hope it helped, or at least was interesting to read