Loads of people do not really like the newest version of Photos for various reasons.  However the new Photos has an abundance of tools to manipulate your photos.  Simply open Photos and then click the ‘Edit’ button in the upper righthand corner.  You can crop, rotate, edit, filter, retouch and many other manipulations.  It is a great way to make those photos really stand out.   Here is a great how to for editing your photos with Mac Photos.