If you're really serious, sign up for an account on linuxacademy.com They have full courses to prepare you for what you're asking. They have their own cloud setup (to deploy a temporary server for practicing excersies) and you can build, destroy, rebuild systems to practice items like Apache setup, nginx setup, modifying selinux policies, user administration, etc etc. For a serious career change, it is definitely... - Source: Reddit / 5 months ago
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