What are things I can do now that my baby is 9 months old, to ensure that she doesn't become a brat?

I believe, being a brat is somehow related to being a picky eater. My baby is 6 months and in few days we'll feed her solids. From what I've read, we should only offer mashed veggies to our baby purely, I mean, without any sugar or salt so that he or she'll not look and hook at the sweet and salty taste in the future. Also, if you're exclusively breastfeeding, try to put some breastmilk on your baby's mashed food so that he or she'll still smell and taste the breastmilk.