Have I over-developed my film?

setting aside all chemical reactions, which I won't understand, what happens when you develop a roll of film? Do parts of the film turn from opaque to transparent? If this is the case, will developing for too long make the transparent areas on negative, ie black bits on print, more transparent and therefore more black, increasing contrast but lessining detail in dark areas? I want to know whether I've over-developed or underdeveloped. I think the contrast of the shots I took was OK. I'm using Tri-x with T-max developer 1 part dev to 4 parts water, at 20-22c. Thanks Greg

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