Seeing help tidbits again

When i first used unreal, when I would do something it would bring up a window which would give like a presentation of the topic, and you could clip to go to the next part, etc. However I was dumb at the time and closed them out. Is there anyway to be able to view them again? Also, is there a place where I can see all the custom macros and all the blueprints that come already packaged with unreal? I looked through the directory and still could not find,nor could I in the help file. Thanks guys again, you all are wonderful in responding even for newbies like me , I appreciate it!