I find that a lot of the video tutorials use the level blueprint as a shortcut when setting a reference to an object. You wouldn’t do this in a proper game as you’d have to write the logic every level. They should point out that this isn’t the method you should be using as it confuses beginners.
Also they tend to write all the blueprints in the main blueprint instead of using functions and macros. Makes the blueprints very messy and harder to follow.
Other than that I’ve found most of the tutorials useful and easy to follow. I went through the UMG ones for the first time the other day and had a working main menu, pause menu and player HUD within the hour. Considering how complicated the old ue3 scaleform was to use UMG is a piece of genius.