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I never installed Linux myself, only used it for a bit, so what do you have to do to not be a complete noob? This is only a half serious question, but what do you think you have to do, to be a proficient Linux user? This sounds a bit like when I got my master’s degree and did not have the feeling that I know anything or have learned valuable skills, but to someone with only a high school diploma I would look rather proficient.
What does this locking do? Where I live every online vendor offers to pay by installments which addresses the issue that people could not afford the upfront price, why do the phones have to be locked in the US?