Does speaking at conferences help your Career a lot? If so what level/who does it help and how does it help? Also what kind of talks are just 15 minutes of fame and ones that are more impactful?
Also what conference do you think are the best to talk at?
Yes if your talk is insightful and helpful for the audience. You must improve their understand by the end of the talk.
No if you are throwing together a bunch of slides and filling your presentation with knowledge and explaning buzz words that is already known by some executives/directors in that industry.
You should do a better job than a video on youtube and that is a high bar to clear.