Images are an important part of learning; however, copyright laws tend to be confusing and murky. Therefore, it is important to find tools that will help you find royalty-free images.
If you use Google Slides, then you might want to check out the Unsplash Photos Add-On. You can easily search and add high-resolution royalty-free photos to your Slides presentation.
Yes, Google Slides does have a feature to insert royalty-free photos into your presentations. However, it's library is often limited. I like Unsplash Photos because it has a variety of high-quality images, which have been curated by people from around the globe.