Your growth is limited as an engineer if you do not constantly learn from experts in your field.
…line length are cl…line length are closely connected. They work for each other harmoniously is the key to readability. Keep the number of character per line within 30–40 is a good choice.
…ead…eading, but still, it’s a little bit shorter, users may have a feeling that the text is tighten up. In design, the standard leading should be 120% the point size of the font. Another common used tip: short line length requires less leading.