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

major league baseball

explanation:

jack roosevelt robinson broke the color barrier in major league baseball.as he was the first african american to play in the major leagues, jackie robinson became the target of racial abuse. jackie robinson is referring to the historic event, harlem riot.