[itisit]

System design is very easy because you're always inheriting a prior design that exists in actuality or borrowing from a model. Just make sure the new design lowers cost, reduces complexity, improves security, and/or unlocks potential value. ;)

The best way to get hands-on practice is to do just that. The tech part of system design is nothing; it's dealing with an organization and its myriad biases, politics, and reservations that'll teach you the most about the practice.