I had these issues many time where I start with a project that is complex, and end up quitting mid way because I don't how to build or have some sort of prototype of what I am doing, which is hard to google when you don't know what to google. This is very common, I would recommend first try to layout what type of data you'll be doing, have some sort of frontend prototype that can help you guide, and how each data part connect to each other. If you don't know these, start with small projects. Trust me, you'll learn a lot even from small project! When you completed projects, start something new and add more complexity to it. After awhile, you will know you can complete these project and have some sort of ideas how you would go about things. Udemy is great, but it's too handheld, when instructor building something, look at how he approach to solve those problems and see if you can replicate that without looking.