How to approach your audience
Regardless of the location, stage, or the characteristics of your audience, everybody who attends a concert wants the same: to be entertained, wowed, soothed, and taken away.
For most artists, how to approach the audience starts as at impossible knot of anxious questions: 'am I doing this right?', 'will they like it?', 'what if I make a mistake?'. The key to improve your audience management skills isn't to find the answer to all those questions, but to realise that they don't matter, at least not as much as you might think.
You can look at it like this: what is under your control, like how well you learn your musical pieces, is under your control, so there's no need to worry. What is not under your control, like whether the grumpy looking person at the end of the fifth row is enjoying themselves, is not under your control, so why worry about it? Of course, you should think of your audience, what they want and expect, but not to the point that the thought interferes with your ability...