The way I see it, then basically making slides in google slides is a little bit tricky without any additional tools. If you want to try to do it, in principle, I can advise you to go to this site https://slidepeak.com/google-slides-presentation-design , and here you can find yourself a good opportunity to make your google slide much more informative and creative. And that in principle, will be appreciated by the people who will watch them.