Learn English – What’s the difference between “I have to get to” and “I have to go to”

Assuming you have only a tiny piece of paper and want to jot down the gist of the most common uses (each has alternate meanings and many times they can be used interchangeably, either because the speaker is speaking loosely, or figuratively):

1) To understand something : to comprehend it

Do you understand how RNA transcription works?

2) To find something out : to learn about something by asking deliberately

I'll find out when the shop opens tomorrow morning by phoning the proprietor.

b) or accidentally e.g. by overhearing it being spoken about, etc

I found out that Mary and John are going to have a baby. She was trying on maternity clothes in the department store.

3) To discover something : to learn something through experimentation

Vaccines are discovered by scientists.

4) To realize something : to suddenly understand or recall something

I just realized that we cannot go to the beach next Saturday; that's the day of John's wedding.

I just realized that Superman is actually Clark Kent. (or that Clark Kent is actually Superman).

5) To perceive something : to sense something; to "see" it figuratively

I perceived that something was amiss with their relationship. John seemed on edge and Mary was distant.

In my opinion, the author's wording is a little awkward, but understandable after a moment.

face
noun
5 : surface: a (1) : a front, upper, or outer surface (2) : the front of something having two or four sides (3) : facade
tr. v.
4. b : to have the front oriented toward <a house facing the park>
intr. v.
1 : to have the face or front turned in a specified direction
2 : to turn the face in a specified direction

The verb face can be used with things that don't actually have a (human) face. The thing needs to be or have a "front" part. So when two people stand so that their chests and shoulders face each other, the chest and shoulders are more or less parallel to one another. They look like this. Their entire bodies are toward each other and in front of each.

Here is a different example.

Notice that their faces are facing one another, but their bodies are not. They are not positioned like the two women above. B's body is partly facing A's body, but their chests are not facing one another.

judging by wherever they are facing their chest and shoulders.

If B wanted to follow the author's advice, then B would use A's chest and shoulders to determine where he (B) should move/stand so that his body is in front of A and so that their chests are parallel. Then they would be facing each other like the women above.