Start by looking at the jobs in the area where you want to live, if you can look at history to see if there is significant growth in one of the frameworks you are considering. If there is no significant change over time pick the one with the most jobs or pick the one with the most jobs at the companies you are interested in joining.
Then learn the one that has the most upside based on your employment research.
If it is purely to learn, pick one and move through all three at a rudimentary level, then pick one to deep dive.
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