Understand this <concept>

[Jignesh77]

key concept – move from general to particular
Before you read on it will help to understand this concept:

http://www.dcielts.com/ielts-essays/introduction-topic-sentences/
What do they mean by "concept ".
I have already checked the dictionaries but want a lucid explanation.
Thanks
Jignesh

 

[bennymix]

From M-W online

any idea of what a thing ought to be <a society with no concept of private property

==
On the page you mention, the author give a general idea {concept} of how a paragraph should proceed.

 

[suzi br]

They want you to understand an important idea. It sounds a bit posher than "idea" but it shares the same meaning in this context.