Don't start with learning apps. You will learn apps, but not how to design a product.
Learn to see, first. Learn the fundamentals.
You don't need to be awesome at drawing, but doing so trains your eye better than anything else.
My professor from Uni-Days wrote a thing to get started:
A quick beginner’s guide to drawing
He also did a TEDx-Talk on a related topic:
How drawing helps you think
Get any book on typography-basics and learn what makes a readable experience, a good composition and layout. Most websites, apps, digital products boil down to typography.
Modern apps and websites are closer to product-design, than to graphic-design. Learn what makes a product enjoyable and usable.
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