Nice article! Jaime.
One key takeaway that I learned (and blogged about on my personal blog once) Is that I need to do a side-project with one main goal: is it to learn something, or to make it into a viable, sellable product.
Mixing the two doesn't work since if you want to make money off a product, it's best to put in the least amount of effort (use things you already master) and gets user validation ASAP.
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