Legibility
Polish communication with typographic clarity.
The ease with which a reader can decode symbols is known as legibility. In design, legibility is typically separated from readability, which is when a reader can follow and understand words, phrases, and paragraphs.
Leading and Line-Height
Leading, a.k.a. line-height in digital circles, is the space between baselines in a block of text.
The gap between adjacent lines of type in typography is known as leading. In CSS, the line-height property specifies the amount of space between inline elements.
Layered Complexity
Simple isn’t always better, sometimes you have to selectively layer complexity into your products.
Software can be divided in many ways, but through experience and convention, we've discovered that layering the complexity broadens a system's appeal to a greater number of users.