Can i start a sentence with so ? or will that be consider a error

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

in the quotation from passage, connie willis states that literature is a way for authors from the past to communicate with readers of today. we can read their stories, books, and other texts to learn lessons about life. willis refers to these lessons as messages “from beyond the grave.” willis has a favorable viewpoint about the timelessness of literature.

what are the choises i cant answer without choises