We usually use roundior movement or position in a circle, or in a curve.

• We all sat round the table.
  
• I walked round the car and looked at the wheels.
  
• 'Where do you live?' 'Just round the corner.'
  

How to use the preposition "about" correctly?

About identifies a topic.

Pattern 1: noun + be + about + noun
This book is about prepositions.