Use "learn of" in situations where news or new information is received. Use "learn about" to refer to studying, investigating, or becoming familiar with a subject.
Use "learn to" to express that someone is acquiring a new skill or behavior. Use "learn how to" to emphasize the process or method by which one acquires the skill or knowledge.
The phrases "in the long term" and "in the long run" are often used interchangeably to describe a situation or effect that will happen over an extended period of time.
The phrases "in the short term" and "in the short run" are often used interchangeably. However, they can have subtle differences depending on the context.