I've been searching around for an easy way to find images on here without worrying about copyright infringement and everything else. I've found two sites that are very user friendly and mostly are FREE !!! One is Free Stock Images & Photos by StockFreeImages.com, another is https://www.pexels.com/. And if you prefer to use Google, here's an easy way to find what you're looking for:
I use that all the time and occasionally find what I'm looking for. If I run across other free sites to use for posting pictures, I'll let you know.