I also wanned to share my thoughts on this. I personally wouldn’t recommend modifying an existing project. There might be other things in the background overriding / interfering with your changes and it’d be a pain to figure out what it is since you’re not the one who made them!
@LoadCreator, to learn Unreal, I’d suggest starting a demo project where you set your own objectives. You can do some research whenever you come across an obstacle, and make use of tutorials online. This way you’d be forced to grasp the concept and implement to fit your use case, instead of copy & pasting which is what’s done while following complete project series.
It’s also worth mentioning that there’s absolutely nothing you can’t learn online about Unreal, same for learning C++ and Unreal C++. So I’d highly discourage purchasing a course. Sure there can be a severe lack of documentation on certain aspects but with some testing yourself, it’s really not an issue.
Oh and also, you can continue asking further questions on Discord for your older task.
Hope these help! 
(Why does it seem like I specifically replied to another user 
I thought I just pressed the general reply button)