Idle Speed. What makes it right?

I reread the thread and everyone with lot of experience are saying to use what makes the engine happy etc.. That is a learned process and it takes some experience to get it right. @TT5.9mag you did say to "watch" the vacuum and RPMs while making adjustments. What I did not know was what to "watch" for, More or less vacuum, more rpms, what vacuum should be in the ball park. I am a rookie here and trying to learn from others. Unfortunately, I have no one to show me the ropes and a recipe to follow would help. Everyone is so well intended, knowledgeable and helpful but they were speaking as though I knew what a happy motor was. My experience is inline 6 chevy only. Not a big block mopar. It runs ok but I wanted to go through the process of refining the idle speed, the AFR at idle and the timing at idle. Just for my own benefit and knowledge. The base parameters work but are they the best? I will adjust all for maximum vacuum and try to find where it is happy.