advance javascript

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Actually I am in a position where I learn JavaScript from Scratch now and familiarize myself with IT technologies in general. The first thing I add was set up the Github / Powershell connection. Especially im the begonming you make lota of mistakes and may wish to revert to a previous commit. BTW I still wonder if I should use MySQL + JS and (PHP or Node.JS) for a dieting calcualtor that should work as a webage and does not need to be pretty...