As other people said here, I think learning multiple things at the same time is not a good idea, multitasking is generally not a good way.
I used to learn multiple languages at the same time and the only time it wasn't a bad idea is when I decide to learn the functional paradigm through a language : first a learned multiple language ( Scala, Java 8 Streams, Kotlin ) then I selected one and " forget " the others. That's allow me to select the language I preferred the most and made my learning session less painful.
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