If you want to appear warm and friendly, but also cutting-edge, Avenir (meaning "future" in French) is a good font to ...

Checkout Best Google Slides Add-Ons for presentations, including LucidChart Diagrams, Unsplash Photos, Hypatia Create, Flaticon, and Slido.

And key to that is picking the best fonts for presentations, which need to tick a number of boxes (you can't just pick any old free font available).