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I need an effective system for other things, like SQL, or generally anything I learn or need to keep track of for future reference. I tried google docs, sheets, even slides, txt files (with my always open sublime text), etc. etc. I find my stuff is scattered all over the place and isn't very productive or efficient.
Any insights?
(side note: I tried looking for going rates of US data scientists on freelancing websites like upwork, but the hourly rates are all over the place, from $20 to $200).
Appreciate your insights!