Using Commas with Intro Words
Some sentences start with intro words.
In writing each project is like a journey.
("In writing" introduces the sentence.)
When you have four or more intro words, place a comma after them.
For a long journey, you start by gathering everything you'll need on the trail.
(A comma follows "For a long journey.")
Readers are looking for the main part of the sentence, with a subject + verb pattern. The comma signals that the main part of the sentence is starting.