Struggling to understand what you read?Learn to summarise.

In reading we have been learning to summarise a text.Summariseing is putting the main ideas into a nutshell not all the ideas.I am not that confident in summariseing, but I think I am getting there. We have all so been practicing idioms,pridicting,reading,clarify,ask question an discuss,lastley sammarise.I am confident with all these except summrising.I would proably get two ticks fo my confidents with summariseing ?