Another good resource for learning how to draw realistically is the book: "Drawing on the Right Side of the Brain". The premise is that your brain wants to take shortcuts and group/chunk things together on what they should look like, instead of what things actually look like. But even a rectangle in real life has non-right-angles because of perspective, etc.. And if you draw what you actually see, then the drawings come out correct. Some of the exercises are copying other drawings placed upside-down, so that you brain doesn't try to over-interpret things. I can't recommend this enough if you want to go from a beginner to something respectable in drawing abilities.
I read the book and loved it (about 15 years ago). There’s no royal road to becoming an artist but lots of joy along the way. Whatever the path, enjoy it!
https://www.amazon.com/Drawing-Right-Side-Brain-Definitive/d...
https://kk.org/cooltools/drawing-on-the-right-side-of-the-br...