I have this issue with I guess you could say "thinking". I struggle to comprehend a topics unless I feel I understand ever aspect of it. Car engines, you say pistons move up and down because of gas burning and expanding causing rotation and that causes a car to go forward, that's the simple explanation of a car engine. Sure that's simple. but when I think about it, how does that rotation make the car move? The simple explanation explained nothing to me. Where does the transmission come into this? Where are the gears the turn the bar that the wheels are attached to? I watched a whole video on how an engine works but the video never explained how engine rotation turns into wheel rotation, so I don't feel I really know how an engine works.

This is true of basically any topic that is technical or complex. I struggle to code because I just don't grasp how every piece works down to the bits that the computer understand with the on or off state of the transistors. I struggle with the basics of networking because I don't understand how a packet is transformed at every step from PC to gateway out to other AS or routers, even though I have watched and studied countless videos about packets and headers at each layer. But I can setup STP, OSPF, SVIs, etc. I feel like I can never understand anything, yet I somehow pull of technically challenging tasks on a regular basis as an IT person. I just feel I know nothing all the time.