New Member And New Coin Collector.

Hello all, my name is Andrew and I've been collecting old coins since I was young (31 now) but I've never really known much about them (except to check for 1943 copper pennies, duh right?). My grandpa got me into it and I inherited his old collection (mostly wheaties, 1900's and after so nothing too old), but stopped somewhere between middle/high school because I was too cool or I thought it was nerdy or whatever; teenagers am I right?
Anyways I have recently taken interest in coins again, especially looking for error coins in change; I find myself inspecting every single coin that comes into my hands now haha. I don't really know what to look for now, especially when it comes to mint errors and PMD. I hope I can learn from you all, and hopefully you would be willing to impart your knowledge onto me. I have a few coins I have questions about which I will be posting and I hope you guys help by telling me not only that the coin is not a mint error, but also why or how you can tell.
I tried posting to Coin Talk with some questions a few days ago but I was met with a swift ban, and I hope you all are more noobie friedly.

Thanks for your time,
~Andrew