Clipboard Usage

Hello Everyone, I just joined your site and would like to say hello to everyone first! I understand that after reading some of the comments that most of you are computer pros, so I was a little hesitant to ask this question. Can anyone explain to me how to use the Clipboard properly? I have copied different things to the Clipboard that I’ve come across, but I don’t know how to find them on the Clipboard? Thanks for your patience.