> Are any of these concepts particularly difficult to understand for a seasoned developer? Depending on the personality of the developer: Absolutely. And most

> Are any of these concepts particularly difficult to understand for a seasoned developer? Depending on the personality of the developer: Absolutely. And most of the time it's not about the ability to understand, but the willingness to learn. Yeah, it's a cliché, the old fart, set in their ways, "get off my lawn!1". I know, I'm guilty of it myself sometimes . :) And it's one thing to learn some tech well enough to use it, and still another to grok the concepts and its ramifications, to actually get the whole picture of concepts, procedures and tools currently available to you, to be of help in higher-level planning and strategic decision-making. You know, all the stuff bosses are paid for. :)