Don't cherry pick tutorials that you think will teach you the parts you want to learn, get a proper understanding of the basics, there are plenty of nuggets of gold in every tutorial that will help you in any project you want to do in the future. Doing so will allow you to learn Unitys work flow, the Editor, C# programming, and game development simultaneously while actually creating small games. Don't just watch the tutorials, actually do the tutorials (make your own local project while following along). Complete several or more of the basic tutorials and all of the scripting tutorials. The best, fastest and free way to learn is to click on the Learn link at the top of this page. This will not help you in learning Unity or game development, which was your stated desired intention. Join Kids Teach Tech on Zoom for a Fun and Exciting Live Online Camp with plenty of personal attention for learning.

Yes re-skinning is simply swapping out sprites and textures (artwork). Crossy Road Camp using Scratch Programming. Reverse engineering when you have no previous experience just doesn't work and will leave you confused and discouraged. You need to learn Unity, it's Editor and C# programming before starting off on you own. Purchasing a complete project or just a bunch of assets is not going to help you the way you think.

Learn code crossy road