Ways to grow my knowledge

I am 19 and have been running AS/400 processes for a year now and am looking to branch out to firmly understand everything on the systems. Obviously on client systems I don’t exactly want to mess around. I am thinking of emulation of something as close as I could get. I also do not know what I could do with it? I’m sure I could build it some simple programs but I would like to have tips/ ideas. I really enjoy these systems and want to learn more (for free) and am happy to try anything. Thanks.

submitted by /u/flyer922
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