It gives you amazing features such as SSL certificate (free), free images from their library to use in your projects or even create new ones with nice icons that have been added by them! The only downside of this service I've found so far would be its speed because it seems not very fast when loading pages/images but overall pretty good if used correctly like how they recommend doing!! If anyone needs an image source then go ahead using bootstrapsCDNs. They offer almost all types including SVG which isn't common elsewhere at least where i live :).