Is there an online library of Mathematica Slideshows created by users?

I am experimenting with using Mathematica instead of Powerpoint because of the Manipulate functionality, but
I am struggling with basic things like centering an image and textwrap stuff. I just wanted to see what people
have been able to do with Mathematica Slideshows.

Thanks!

There are many places where you can find Mathematica Slideshows, created not only by users but also Wolfram Research. For example, these free training courses

very often have a notebook of the course attached to the top right corner of the video:

Another place is Wolfram Technology Conference:

Here on Wolfram Community people also often attach presentations, for example some posts here (see attachments at the end of the posts):

http://community.wolfram.com/web/ihcomm

Slideshows are basically same notebooks with different stylesheet. There are some templates but for deeper design this might be useful: Working with Stylesheets

Have you seen this? - How to | Create a Slide Show

Thanks- I saw the official page on slide show, but users’ examples is exactly what I was looking for–thanks for the tech link. It’s perfect for me!