Also, if you know all this, you have an advantage over a lot of green coders that came up focusing on the frameworks and higher level technologies. This shows up as next-level debugging and troubleshooting skills when compared to the noobs. I know new kids who can run circles around me when it comes to advanced react topics but can’t do the basic troubleshooting that tells you what layer of the system a request failure came from. Something tells me this old freelancer could.