is there a way to easily resize and crop images in RW 8 ?
Or, do I need to purchase any add-ons ? Which ones ?
Images can and should be resize, cropped and optimized prior to bringing them into the project file. You can do the resizing and cropping with preview that comes with macOS. There’s also a ton of other apps that can do this depending on what you need.
As for the optimization part realmac has squash and there’s a lot of other choices both free and paid.