of requirement which needs a lot of knowledge
Well, you learn about popular industry standards, libraries, tools etc in the field you're interested in. Keep yourself updated is how you do it, anyways your questions are too vague and offtopic to answer correctly. Go to devs chat for vague questions, this is java only group
https://t.me/joinchat/FNPR30QUj4X7ycnEBCoFIg
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