If you are into weight training teach me something about it?

So I am noticing that these days weight training has kind of become " fashionable" amongst men and women and I know nothing about it but I am curious. What I want you to do is provide tips, tricks and information concerning weight training if you practice it. You can even go as far as to illustrate the pros and cons, reasons why one should do it and the misconceptions. Share your knowledge.
If you are into weight training teach me something about it?
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