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Some of the basic things that are necessary to write good content are that it should be concise and crisp, with good cohesion and for ads, it should be catchy as well.
It is an icing on the cake, if it rhymes, especially for ads and slogans.
Coming up with the most appropriate yet uncomplicated content takes time and research.
Following photos show the content written for an ad and a brochure of a pigeon netting company.
To understand the best practices while writing content, you can refer to this link