What are some easy achieve 3000 articles?

Some easy achieved 3000 articles are biographies of a person, history of a country, victims of war, kindness of the strangers, calamity disasters, victims of human trafficking, history of an invention, development of a machine and others.

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.