"About" generally means approximately, concerning, or related to something, and it can also refer to being in the vicinity of a place or expressing intention. Below are its main uses:

Approximately / Around: When used to refer to a quantity or time, "about" means approximately or around that value. For example:

  • "The movie starts at about 7:30 PM." (It starts approximately at 7:30 PM)
  • "I have about 20 dollars in my wallet." (I have approximately 20 dollars)

Concerning / Related to: "About" can also mean concerning or related to a particular topic or subject. For example:

  • "We had a discussion about climate change." (The discussion was related to climate change)

In the vicinity of: When talking about location, "about" can indicate being in the vicinity of a place without specifying an exact location. For example:

  • "I saw him walking about the park." (He was walking around or nearby the park)

Expressing intention: In certain contexts, "about" can be used to express someone's intention or purpose. For example:

  • "I'm thinking about going to the beach tomorrow." (I am considering or planning to go to the beach)

Example sentences

  1. I'll be there at about 7 PM for the dinner reservation.
  2. Can you tell me more about your favorite hobbies?
  3. The book has about 300 pages in total.
  4. We had a serious discussion about the company's future.
  5. I'm thinking about starting a new exercise routine.
  6. The teacher talked to the students about the upcoming field trip.
  7. The kids were running about the playground, laughing and playing.
  8. The restaurant is located at about a 15-minute walk from here.
  9. The movie lasts for about two hours, so make sure you have enough time.
  10. I have a few questions about the new project you proposed.

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Reference:

about
1. on the subject of, or connected with: 2. to take action to solve a problem…

https://www.vocabulary.com/dictionary/about