Learning about ports and exploiting them

Where can I learn about what each port is,does and how to manipulate and exploit it?

I remember finding an open port a while back and I didn't know what it was or anything about it,so I did what most people would do and looked it up,long long long story short I found nothing.

submitted by /u/TheJinn2614
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from hacking: security in practice https://ift.tt/3B4Yz8T