Magic Forums

I wanted to ask one thing, well I made few little mistakes in few in few spells. And that kind of backfired in out of control result. Even when it hasn't caused any problem but feel kind weired to just know it didn't ended up the way it was intended. Those mistakes caused they had bigger range of effect. So what can I do to avoid that happening again if it can be caused by something like missing out anything in spell preparation, or if i need to just add one or two things in it.