Generally in YouTube you can find plenty of video tutorials. But choosing the right one is the difficult task. Go for the one that covers all the concepts from a basic level. For such training I would recommend you to watch this video by Intellipaat. In this tutorial you will come across various concepts of full stack web development, some hands-on labs, and at last some interview questions. Upon completion of watching this video you can have strong foundation of full stack concepts.
Along with that if you are looking for a certification along with training then check out this Full Stack Web Development Course by Intellipaat.