One way is to contribute to a code with others and get into this cycle: 1) Write code that solves problems. Do this a lot. 2) Have other people review the code

One way is to contribute to a code with others and get into this cycle: 1) Write code that solves problems. Do this a lot. 2) Have other people review the code you write, and offer suggestions, improvements, et cetera. Without a job this is more challenging, but you can still start a project or contribute to an open source project. 3) The next time you write code, anticipate what these reviewers will say, and determine if you should apply the advice. Also, read other peoples code, and for whatever language you choose, find the aggregators, reddit, twitter and start reading them. Eventually you'll find someone who write very clear code, and start following them.