Question

how does block selection help in large scale editing ?

Answer 1

Block selection helps in large scale editing to a large extent. One key advantage of block selection is that it minimizes editing time.

For example, let us assume that you want to replace a particular word with another in two paragraphs of a document. You can do block selection of those two paragraphs and use the Replace All function to give the word to be searched for and the word to be replaced with.  You do not have to search each word in the desired paragraphs to do the replacement.