How to identify a main idea of a paragraph

Can anyone tell me how to identify the main idea of a paragraph? Please provide me with a few examples.

Thank you

Hi Nikolay,

To find out the main idea of a paragraph you should carefully read it and then answer this question: “What is this text about?
If you like you can post a short text here and we can do this exercise together.

TOEIC listening, question-response: Are you going to the Christmas party?[YSaerTTEW443543]

Thank you for your help offer. I and a friend of mine are already doing this type of an exercise so I would not need your help. Thank you for offering me help anyway.