So much thanks for your recommendation.
Here are some tips useful for me
1)remember these numbers
3, 1/3, 80%
2) slide, note, and handout
3) detailed preparation—don’t waste others’ time
Aim, audience, core point(if there is only one), design(pen and paper)
4)Pics and stories talk
5)Simplicity, restraint, and understandable
6)contrast and repetion
Things change all the time, so know your case