if you are just jumping into a thought then it isn't wrong.
example:
So today Dustin and I....
if you are doing a proper sentence then yes it is considered and error
It can make your paper more appealing to readers, and/or more informative for the readers as well.
The setting is a small town, where everyone knows each other, if it wasn't a small town, boo Radley might not have been known as well, and people might not have been as suspicious
He hung himself because he didn’t want to “shame the earth goddess.” The Igbo community and the entirety of the Umuofian society considered suicide to be one of the worst commitable crimes ever. To kill oneself while touching the ground was considered disrespectful to the earth gods and therefore he hung himself from the trees.
Hope this helped. The book is pretty good, if you have any more questions on it let me know since I just finished reading this for an AP class.